| # -*- coding: utf-8 -*- |
| # There are tests here with unicode string literals and |
| # identifiers. There's a code in ast.c that was added because of a |
| # failure with a non-ascii-only expression. So, I have tests for |
| # that. There are workarounds that would let me run tests for that |
| # code without unicode identifiers and strings, but just using them |
| # directly seems like the easiest and therefore safest thing to do. |
| # Unicode identifiers in tests is allowed by PEP 3131. |
| |
| import ast |
| import datetime |
| import os |
| import re |
| import types |
| import decimal |
| import unittest |
| import warnings |
| from test import support |
| from test.support.os_helper import temp_cwd |
| from test.support.script_helper import assert_python_failure, assert_python_ok |
| |
| a_global = "global variable" |
| |
| # You could argue that I'm too strict in looking for specific error |
| # values with assertRaisesRegex, but without it it's way too easy to |
| # make a syntax error in the test strings. Especially with all of the |
| # triple quotes, raw strings, backslashes, etc. I think it's a |
| # worthwhile tradeoff. When I switched to this method, I found many |
| # examples where I wasn't testing what I thought I was. |
| |
| |
| class TestCase(unittest.TestCase): |
| def assertAllRaise(self, exception_type, regex, error_strings): |
| for str in error_strings: |
| with self.subTest(str=str): |
| with self.assertRaisesRegex(exception_type, regex): |
| eval(str) |
| |
| def test__format__lookup(self): |
| # Make sure __format__ is looked up on the type, not the instance. |
| class X: |
| def __format__(self, spec): |
| return "class" |
| |
| x = X() |
| |
| # Add a bound __format__ method to the 'y' instance, but not |
| # the 'x' instance. |
| y = X() |
| y.__format__ = types.MethodType(lambda self, spec: "instance", y) |
| |
| self.assertEqual(f"{y}", format(y)) |
| self.assertEqual(f"{y}", "class") |
| self.assertEqual(format(x), format(y)) |
| |
| # __format__ is not called this way, but still make sure it |
| # returns what we expect (so we can make sure we're bypassing |
| # it). |
| self.assertEqual(x.__format__(""), "class") |
| self.assertEqual(y.__format__(""), "instance") |
| |
| # This is how __format__ is actually called. |
| self.assertEqual(type(x).__format__(x, ""), "class") |
| self.assertEqual(type(y).__format__(y, ""), "class") |
| |
| def test_ast(self): |
| # Inspired by http://bugs.python.org/issue24975 |
| class X: |
| def __init__(self): |
| self.called = False |
| |
| def __call__(self): |
| self.called = True |
| return 4 |
| |
| x = X() |
| expr = """ |
| a = 10 |
| f'{a * x()}'""" |
| t = ast.parse(expr) |
| c = compile(t, "", "exec") |
| |
| # Make sure x was not called. |
| self.assertFalse(x.called) |
| |
| # Actually run the code. |
| exec(c) |
| |
| # Make sure x was called. |
| self.assertTrue(x.called) |
| |
| def test_ast_line_numbers(self): |
| expr = """ |
| a = 10 |
| f'{a * x()}'""" |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 2) |
| # check `a = 10` |
| self.assertEqual(type(t.body[0]), ast.Assign) |
| self.assertEqual(t.body[0].lineno, 2) |
| # check `f'...'` |
| self.assertEqual(type(t.body[1]), ast.Expr) |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) |
| self.assertEqual(len(t.body[1].value.values), 1) |
| self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue) |
| self.assertEqual(t.body[1].lineno, 3) |
| self.assertEqual(t.body[1].value.lineno, 3) |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) |
| # check the binop location |
| binop = t.body[1].value.values[0].value |
| self.assertEqual(type(binop), ast.BinOp) |
| self.assertEqual(type(binop.left), ast.Name) |
| self.assertEqual(type(binop.op), ast.Mult) |
| self.assertEqual(type(binop.right), ast.Call) |
| self.assertEqual(binop.lineno, 3) |
| self.assertEqual(binop.left.lineno, 3) |
| self.assertEqual(binop.right.lineno, 3) |
| self.assertEqual(binop.col_offset, 3) |
| self.assertEqual(binop.left.col_offset, 3) |
| self.assertEqual(binop.right.col_offset, 7) |
| |
| def test_ast_line_numbers_multiple_formattedvalues(self): |
| expr = """ |
| f'no formatted values' |
| f'eggs {a * x()} spam {b + y()}'""" |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 2) |
| # check `f'no formatted value'` |
| self.assertEqual(type(t.body[0]), ast.Expr) |
| self.assertEqual(type(t.body[0].value), ast.JoinedStr) |
| self.assertEqual(t.body[0].lineno, 2) |
| # check `f'...'` |
| self.assertEqual(type(t.body[1]), ast.Expr) |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) |
| self.assertEqual(len(t.body[1].value.values), 4) |
| self.assertEqual(type(t.body[1].value.values[0]), ast.Constant) |
| self.assertEqual(type(t.body[1].value.values[0].value), str) |
| self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue) |
| self.assertEqual(type(t.body[1].value.values[2]), ast.Constant) |
| self.assertEqual(type(t.body[1].value.values[2].value), str) |
| self.assertEqual(type(t.body[1].value.values[3]), ast.FormattedValue) |
| self.assertEqual(t.body[1].lineno, 3) |
| self.assertEqual(t.body[1].value.lineno, 3) |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) |
| self.assertEqual(t.body[1].value.values[1].lineno, 3) |
| self.assertEqual(t.body[1].value.values[2].lineno, 3) |
| self.assertEqual(t.body[1].value.values[3].lineno, 3) |
| # check the first binop location |
| binop1 = t.body[1].value.values[1].value |
| self.assertEqual(type(binop1), ast.BinOp) |
| self.assertEqual(type(binop1.left), ast.Name) |
| self.assertEqual(type(binop1.op), ast.Mult) |
| self.assertEqual(type(binop1.right), ast.Call) |
| self.assertEqual(binop1.lineno, 3) |
| self.assertEqual(binop1.left.lineno, 3) |
| self.assertEqual(binop1.right.lineno, 3) |
| self.assertEqual(binop1.col_offset, 8) |
| self.assertEqual(binop1.left.col_offset, 8) |
| self.assertEqual(binop1.right.col_offset, 12) |
| # check the second binop location |
| binop2 = t.body[1].value.values[3].value |
| self.assertEqual(type(binop2), ast.BinOp) |
| self.assertEqual(type(binop2.left), ast.Name) |
| self.assertEqual(type(binop2.op), ast.Add) |
| self.assertEqual(type(binop2.right), ast.Call) |
| self.assertEqual(binop2.lineno, 3) |
| self.assertEqual(binop2.left.lineno, 3) |
| self.assertEqual(binop2.right.lineno, 3) |
| self.assertEqual(binop2.col_offset, 23) |
| self.assertEqual(binop2.left.col_offset, 23) |
| self.assertEqual(binop2.right.col_offset, 27) |
| |
| def test_ast_line_numbers_nested(self): |
| expr = """ |
| a = 10 |
| f'{a * f"-{x()}-"}'""" |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 2) |
| # check `a = 10` |
| self.assertEqual(type(t.body[0]), ast.Assign) |
| self.assertEqual(t.body[0].lineno, 2) |
| # check `f'...'` |
| self.assertEqual(type(t.body[1]), ast.Expr) |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) |
| self.assertEqual(len(t.body[1].value.values), 1) |
| self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue) |
| self.assertEqual(t.body[1].lineno, 3) |
| self.assertEqual(t.body[1].value.lineno, 3) |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) |
| # check the binop location |
| binop = t.body[1].value.values[0].value |
| self.assertEqual(type(binop), ast.BinOp) |
| self.assertEqual(type(binop.left), ast.Name) |
| self.assertEqual(type(binop.op), ast.Mult) |
| self.assertEqual(type(binop.right), ast.JoinedStr) |
| self.assertEqual(binop.lineno, 3) |
| self.assertEqual(binop.left.lineno, 3) |
| self.assertEqual(binop.right.lineno, 3) |
| self.assertEqual(binop.col_offset, 3) |
| self.assertEqual(binop.left.col_offset, 3) |
| self.assertEqual(binop.right.col_offset, 7) |
| # check the nested call location |
| self.assertEqual(len(binop.right.values), 3) |
| self.assertEqual(type(binop.right.values[0]), ast.Constant) |
| self.assertEqual(type(binop.right.values[0].value), str) |
| self.assertEqual(type(binop.right.values[1]), ast.FormattedValue) |
| self.assertEqual(type(binop.right.values[2]), ast.Constant) |
| self.assertEqual(type(binop.right.values[2].value), str) |
| self.assertEqual(binop.right.values[0].lineno, 3) |
| self.assertEqual(binop.right.values[1].lineno, 3) |
| self.assertEqual(binop.right.values[2].lineno, 3) |
| call = binop.right.values[1].value |
| self.assertEqual(type(call), ast.Call) |
| self.assertEqual(call.lineno, 3) |
| self.assertEqual(call.col_offset, 11) |
| |
| def test_ast_line_numbers_duplicate_expression(self): |
| expr = """ |
| a = 10 |
| f'{a * x()} {a * x()} {a * x()}' |
| """ |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 2) |
| # check `a = 10` |
| self.assertEqual(type(t.body[0]), ast.Assign) |
| self.assertEqual(t.body[0].lineno, 2) |
| # check `f'...'` |
| self.assertEqual(type(t.body[1]), ast.Expr) |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) |
| self.assertEqual(len(t.body[1].value.values), 5) |
| self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue) |
| self.assertEqual(type(t.body[1].value.values[1]), ast.Constant) |
| self.assertEqual(type(t.body[1].value.values[1].value), str) |
| self.assertEqual(type(t.body[1].value.values[2]), ast.FormattedValue) |
| self.assertEqual(type(t.body[1].value.values[3]), ast.Constant) |
| self.assertEqual(type(t.body[1].value.values[3].value), str) |
| self.assertEqual(type(t.body[1].value.values[4]), ast.FormattedValue) |
| self.assertEqual(t.body[1].lineno, 3) |
| self.assertEqual(t.body[1].value.lineno, 3) |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) |
| self.assertEqual(t.body[1].value.values[1].lineno, 3) |
| self.assertEqual(t.body[1].value.values[2].lineno, 3) |
| self.assertEqual(t.body[1].value.values[3].lineno, 3) |
| self.assertEqual(t.body[1].value.values[4].lineno, 3) |
| # check the first binop location |
| binop = t.body[1].value.values[0].value |
| self.assertEqual(type(binop), ast.BinOp) |
| self.assertEqual(type(binop.left), ast.Name) |
| self.assertEqual(type(binop.op), ast.Mult) |
| self.assertEqual(type(binop.right), ast.Call) |
| self.assertEqual(binop.lineno, 3) |
| self.assertEqual(binop.left.lineno, 3) |
| self.assertEqual(binop.right.lineno, 3) |
| self.assertEqual(binop.col_offset, 3) |
| self.assertEqual(binop.left.col_offset, 3) |
| self.assertEqual(binop.right.col_offset, 7) |
| # check the second binop location |
| binop = t.body[1].value.values[2].value |
| self.assertEqual(type(binop), ast.BinOp) |
| self.assertEqual(type(binop.left), ast.Name) |
| self.assertEqual(type(binop.op), ast.Mult) |
| self.assertEqual(type(binop.right), ast.Call) |
| self.assertEqual(binop.lineno, 3) |
| self.assertEqual(binop.left.lineno, 3) |
| self.assertEqual(binop.right.lineno, 3) |
| self.assertEqual(binop.col_offset, 13) |
| self.assertEqual(binop.left.col_offset, 13) |
| self.assertEqual(binop.right.col_offset, 17) |
| # check the third binop location |
| binop = t.body[1].value.values[4].value |
| self.assertEqual(type(binop), ast.BinOp) |
| self.assertEqual(type(binop.left), ast.Name) |
| self.assertEqual(type(binop.op), ast.Mult) |
| self.assertEqual(type(binop.right), ast.Call) |
| self.assertEqual(binop.lineno, 3) |
| self.assertEqual(binop.left.lineno, 3) |
| self.assertEqual(binop.right.lineno, 3) |
| self.assertEqual(binop.col_offset, 23) |
| self.assertEqual(binop.left.col_offset, 23) |
| self.assertEqual(binop.right.col_offset, 27) |
| |
| def test_ast_numbers_fstring_with_formatting(self): |
| t = ast.parse('f"Here is that pesky {xxx:.3f} again"') |
| self.assertEqual(len(t.body), 1) |
| self.assertEqual(t.body[0].lineno, 1) |
| |
| self.assertEqual(type(t.body[0]), ast.Expr) |
| self.assertEqual(type(t.body[0].value), ast.JoinedStr) |
| self.assertEqual(len(t.body[0].value.values), 3) |
| |
| self.assertEqual(type(t.body[0].value.values[0]), ast.Constant) |
| self.assertEqual(type(t.body[0].value.values[1]), ast.FormattedValue) |
| self.assertEqual(type(t.body[0].value.values[2]), ast.Constant) |
| |
| _, expr, _ = t.body[0].value.values |
| |
| name = expr.value |
| self.assertEqual(type(name), ast.Name) |
| self.assertEqual(name.lineno, 1) |
| self.assertEqual(name.end_lineno, 1) |
| self.assertEqual(name.col_offset, 22) |
| self.assertEqual(name.end_col_offset, 25) |
| |
| def test_ast_line_numbers_multiline_fstring(self): |
| # See bpo-30465 for details. |
| expr = """ |
| a = 10 |
| f''' |
| {a |
| * |
| x()} |
| non-important content |
| ''' |
| """ |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 2) |
| # check `a = 10` |
| self.assertEqual(type(t.body[0]), ast.Assign) |
| self.assertEqual(t.body[0].lineno, 2) |
| # check `f'...'` |
| self.assertEqual(type(t.body[1]), ast.Expr) |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) |
| self.assertEqual(len(t.body[1].value.values), 3) |
| self.assertEqual(type(t.body[1].value.values[0]), ast.Constant) |
| self.assertEqual(type(t.body[1].value.values[0].value), str) |
| self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue) |
| self.assertEqual(type(t.body[1].value.values[2]), ast.Constant) |
| self.assertEqual(type(t.body[1].value.values[2].value), str) |
| self.assertEqual(t.body[1].lineno, 3) |
| self.assertEqual(t.body[1].value.lineno, 3) |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) |
| self.assertEqual(t.body[1].value.values[1].lineno, 4) |
| self.assertEqual(t.body[1].value.values[2].lineno, 6) |
| self.assertEqual(t.body[1].col_offset, 0) |
| self.assertEqual(t.body[1].value.col_offset, 0) |
| self.assertEqual(t.body[1].value.values[0].col_offset, 4) |
| self.assertEqual(t.body[1].value.values[1].col_offset, 2) |
| self.assertEqual(t.body[1].value.values[2].col_offset, 11) |
| # NOTE: the following lineno information and col_offset is correct for |
| # expressions within FormattedValues. |
| binop = t.body[1].value.values[1].value |
| self.assertEqual(type(binop), ast.BinOp) |
| self.assertEqual(type(binop.left), ast.Name) |
| self.assertEqual(type(binop.op), ast.Mult) |
| self.assertEqual(type(binop.right), ast.Call) |
| self.assertEqual(binop.lineno, 4) |
| self.assertEqual(binop.left.lineno, 4) |
| self.assertEqual(binop.right.lineno, 6) |
| self.assertEqual(binop.col_offset, 3) |
| self.assertEqual(binop.left.col_offset, 3) |
| self.assertEqual(binop.right.col_offset, 7) |
| |
| expr = """ |
| a = f''' |
| {blech} |
| ''' |
| """ |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 1) |
| # Check f'...' |
| self.assertEqual(type(t.body[0]), ast.Assign) |
| self.assertEqual(type(t.body[0].value), ast.JoinedStr) |
| self.assertEqual(len(t.body[0].value.values), 3) |
| self.assertEqual(type(t.body[0].value.values[1]), ast.FormattedValue) |
| self.assertEqual(t.body[0].lineno, 2) |
| self.assertEqual(t.body[0].value.lineno, 2) |
| self.assertEqual(t.body[0].value.values[0].lineno, 2) |
| self.assertEqual(t.body[0].value.values[1].lineno, 3) |
| self.assertEqual(t.body[0].value.values[2].lineno, 3) |
| self.assertEqual(t.body[0].col_offset, 0) |
| self.assertEqual(t.body[0].value.col_offset, 4) |
| self.assertEqual(t.body[0].value.values[0].col_offset, 8) |
| self.assertEqual(t.body[0].value.values[1].col_offset, 10) |
| self.assertEqual(t.body[0].value.values[2].col_offset, 17) |
| # Check {blech} |
| self.assertEqual(t.body[0].value.values[1].value.lineno, 3) |
| self.assertEqual(t.body[0].value.values[1].value.end_lineno, 3) |
| self.assertEqual(t.body[0].value.values[1].value.col_offset, 11) |
| self.assertEqual(t.body[0].value.values[1].value.end_col_offset, 16) |
| |
| def test_ast_line_numbers_with_parentheses(self): |
| expr = """ |
| x = ( |
| f" {test(t)}" |
| )""" |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 1) |
| # check the joinedstr location |
| joinedstr = t.body[0].value |
| self.assertEqual(type(joinedstr), ast.JoinedStr) |
| self.assertEqual(joinedstr.lineno, 3) |
| self.assertEqual(joinedstr.end_lineno, 3) |
| self.assertEqual(joinedstr.col_offset, 4) |
| self.assertEqual(joinedstr.end_col_offset, 17) |
| # check the formatted value location |
| fv = t.body[0].value.values[1] |
| self.assertEqual(type(fv), ast.FormattedValue) |
| self.assertEqual(fv.lineno, 3) |
| self.assertEqual(fv.end_lineno, 3) |
| self.assertEqual(fv.col_offset, 7) |
| self.assertEqual(fv.end_col_offset, 16) |
| # check the test(t) location |
| call = t.body[0].value.values[1].value |
| self.assertEqual(type(call), ast.Call) |
| self.assertEqual(call.lineno, 3) |
| self.assertEqual(call.end_lineno, 3) |
| self.assertEqual(call.col_offset, 8) |
| self.assertEqual(call.end_col_offset, 15) |
| |
| expr = """ |
| x = ( |
| u'wat', |
| u"wat", |
| b'wat', |
| b"wat", |
| f'wat', |
| f"wat", |
| ) |
| |
| y = ( |
| u'''wat''', |
| u\"\"\"wat\"\"\", |
| b'''wat''', |
| b\"\"\"wat\"\"\", |
| f'''wat''', |
| f\"\"\"wat\"\"\", |
| ) |
| """ |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 2) |
| x, y = t.body |
| |
| # Check the single quoted string offsets first. |
| offsets = [(elt.col_offset, elt.end_col_offset) for elt in x.value.elts] |
| self.assertTrue(all(offset == (4, 10) for offset in offsets)) |
| |
| # Check the triple quoted string offsets. |
| offsets = [(elt.col_offset, elt.end_col_offset) for elt in y.value.elts] |
| self.assertTrue(all(offset == (4, 14) for offset in offsets)) |
| |
| expr = """ |
| x = ( |
| 'PERL_MM_OPT', ( |
| f'wat' |
| f'some_string={f(x)} ' |
| f'wat' |
| ), |
| ) |
| """ |
| t = ast.parse(expr) |
| self.assertEqual(type(t), ast.Module) |
| self.assertEqual(len(t.body), 1) |
| # check the fstring |
| fstring = t.body[0].value.elts[1] |
| self.assertEqual(type(fstring), ast.JoinedStr) |
| self.assertEqual(len(fstring.values), 3) |
| wat1, middle, wat2 = fstring.values |
| # check the first wat |
| self.assertEqual(type(wat1), ast.Constant) |
| self.assertEqual(wat1.lineno, 4) |
| self.assertEqual(wat1.end_lineno, 5) |
| self.assertEqual(wat1.col_offset, 14) |
| self.assertEqual(wat1.end_col_offset, 26) |
| # check the call |
| call = middle.value |
| self.assertEqual(type(call), ast.Call) |
| self.assertEqual(call.lineno, 5) |
| self.assertEqual(call.end_lineno, 5) |
| self.assertEqual(call.col_offset, 27) |
| self.assertEqual(call.end_col_offset, 31) |
| # check the second wat |
| self.assertEqual(type(wat2), ast.Constant) |
| self.assertEqual(wat2.lineno, 5) |
| self.assertEqual(wat2.end_lineno, 6) |
| self.assertEqual(wat2.col_offset, 32) |
| # wat ends at the offset 17, but the whole f-string |
| # ends at the offset 18 (since the quote is part of the |
| # f-string but not the wat string) |
| self.assertEqual(wat2.end_col_offset, 17) |
| self.assertEqual(fstring.end_col_offset, 18) |
| |
| def test_ast_fstring_empty_format_spec(self): |
| expr = "f'{expr:}'" |
| |
| mod = ast.parse(expr) |
| self.assertEqual(type(mod), ast.Module) |
| self.assertEqual(len(mod.body), 1) |
| |
| fstring = mod.body[0].value |
| self.assertEqual(type(fstring), ast.JoinedStr) |
| self.assertEqual(len(fstring.values), 1) |
| |
| fv = fstring.values[0] |
| self.assertEqual(type(fv), ast.FormattedValue) |
| |
| format_spec = fv.format_spec |
| self.assertEqual(type(format_spec), ast.JoinedStr) |
| self.assertEqual(len(format_spec.values), 0) |
| |
| def test_docstring(self): |
| def f(): |
| f"""Not a docstring""" |
| |
| self.assertIsNone(f.__doc__) |
| |
| def g(): |
| """Not a docstring""" f"" |
| |
| self.assertIsNone(g.__doc__) |
| |
| def test_literal_eval(self): |
| with self.assertRaisesRegex(ValueError, "malformed node or string"): |
| ast.literal_eval("f'x'") |
| |
| def test_ast_compile_time_concat(self): |
| x = [""] |
| |
| expr = """x[0] = 'foo' f'{3}'""" |
| t = ast.parse(expr) |
| c = compile(t, "", "exec") |
| exec(c) |
| self.assertEqual(x[0], "foo3") |
| |
| def test_compile_time_concat_errors(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "cannot mix bytes and nonbytes literals", |
| [ |
| r"""f'' b''""", |
| r"""b'' f''""", |
| ], |
| ) |
| |
| def test_literal(self): |
| self.assertEqual(f"", "") |
| self.assertEqual(f"a", "a") |
| self.assertEqual(f" ", " ") |
| |
| def test_unterminated_string(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "unterminated string", |
| [ |
| r"""f'{"x'""", |
| r"""f'{"x}'""", |
| r"""f'{("x'""", |
| r"""f'{("x}'""", |
| ], |
| ) |
| |
| @unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI") |
| def test_mismatched_parens(self): |
| self.assertAllRaise( |
| SyntaxError, |
| r"closing parenthesis '\}' " r"does not match opening parenthesis '\('", |
| [ |
| "f'{((}'", |
| ], |
| ) |
| self.assertAllRaise( |
| SyntaxError, |
| r"closing parenthesis '\)' " r"does not match opening parenthesis '\['", |
| [ |
| "f'{a[4)}'", |
| ], |
| ) |
| self.assertAllRaise( |
| SyntaxError, |
| r"closing parenthesis '\]' " r"does not match opening parenthesis '\('", |
| [ |
| "f'{a(4]}'", |
| ], |
| ) |
| self.assertAllRaise( |
| SyntaxError, |
| r"closing parenthesis '\}' " r"does not match opening parenthesis '\['", |
| [ |
| "f'{a[4}'", |
| ], |
| ) |
| self.assertAllRaise( |
| SyntaxError, |
| r"closing parenthesis '\}' " r"does not match opening parenthesis '\('", |
| [ |
| "f'{a(4}'", |
| ], |
| ) |
| self.assertRaises(SyntaxError, eval, "f'{" + "(" * 500 + "}'") |
| |
| @unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI") |
| def test_fstring_nested_too_deeply(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expressions nested too deeply", |
| ['f"{1+2:{1+2:{1+1:{1}}}}"'], |
| ) |
| |
| def create_nested_fstring(n): |
| if n == 0: |
| return "1+1" |
| prev = create_nested_fstring(n - 1) |
| return f'f"{{{prev}}}"' |
| |
| self.assertAllRaise( |
| SyntaxError, "too many nested f-strings", [create_nested_fstring(160)] |
| ) |
| |
| def test_syntax_error_in_nested_fstring(self): |
| # See gh-104016 for more information on this crash |
| self.assertAllRaise( |
| SyntaxError, "invalid syntax", ['f"{1 1:' + ('{f"1:' * 199)] |
| ) |
| |
| def test_double_braces(self): |
| self.assertEqual(f"{{", "{") |
| self.assertEqual(f"a{{", "a{") |
| self.assertEqual(f"{{b", "{b") |
| self.assertEqual(f"a{{b", "a{b") |
| self.assertEqual(f"}}", "}") |
| self.assertEqual(f"a}}", "a}") |
| self.assertEqual(f"}}b", "}b") |
| self.assertEqual(f"a}}b", "a}b") |
| self.assertEqual(f"{{}}", "{}") |
| self.assertEqual(f"a{{}}", "a{}") |
| self.assertEqual(f"{{b}}", "{b}") |
| self.assertEqual(f"{{}}c", "{}c") |
| self.assertEqual(f"a{{b}}", "a{b}") |
| self.assertEqual(f"a{{}}c", "a{}c") |
| self.assertEqual(f"{{b}}c", "{b}c") |
| self.assertEqual(f"a{{b}}c", "a{b}c") |
| |
| self.assertEqual(f"{{{10}", "{10") |
| self.assertEqual(f"}}{10}", "}10") |
| self.assertEqual(f"}}{{{10}", "}{10") |
| self.assertEqual(f"}}a{{{10}", "}a{10") |
| |
| self.assertEqual(f"{10}{{", "10{") |
| self.assertEqual(f"{10}}}", "10}") |
| self.assertEqual(f"{10}}}{{", "10}{") |
| self.assertEqual(f"{10}}}a{{" "}", "10}a{}") |
| |
| # Inside of strings, don't interpret doubled brackets. |
| self.assertEqual(f'{"{{}}"}', "{{}}") |
| |
| self.assertAllRaise( |
| TypeError, |
| "unhashable type", |
| [ |
| "f'{ {{}} }'", # dict in a set |
| ], |
| ) |
| |
| def test_compile_time_concat(self): |
| x = "def" |
| self.assertEqual("abc" f"## {x}ghi", "abc## defghi") |
| self.assertEqual("abc" f"{x}" "ghi", "abcdefghi") |
| self.assertEqual("abc" f"{x}" "gh" f"i{x:4}", "abcdefghidef ") |
| self.assertEqual("{x}" f"{x}", "{x}def") |
| self.assertEqual("{x" f"{x}", "{xdef") |
| self.assertEqual("{x}" f"{x}", "{x}def") |
| self.assertEqual("{{x}}" f"{x}", "{{x}}def") |
| self.assertEqual("{{x" f"{x}", "{{xdef") |
| self.assertEqual("x}}" f"{x}", "x}}def") |
| self.assertEqual(f"{x}" "x}}", "defx}}") |
| self.assertEqual(f"{x}" "", "def") |
| self.assertEqual("" f"{x}" "", "def") |
| self.assertEqual("" f"{x}", "def") |
| self.assertEqual(f"{x}" "2", "def2") |
| self.assertEqual("1" f"{x}" "2", "1def2") |
| self.assertEqual("1" f"{x}", "1def") |
| self.assertEqual(f"{x}" f"-{x}", "def-def") |
| self.assertEqual("" f"", "") |
| self.assertEqual("" f"" "", "") |
| self.assertEqual("" f"" "" f"", "") |
| self.assertEqual(f"", "") |
| self.assertEqual(f"" "", "") |
| self.assertEqual(f"" "" f"", "") |
| self.assertEqual(f"" "" f"" "", "") |
| |
| # This is not really [f'{'] + [f'}'] since we treat the inside |
| # of braces as a purely new context, so it is actually f'{ and |
| # then eval(' f') (a valid expression) and then }' which would |
| # constitute a valid f-string. |
| self.assertEqual(f'{' f'}', " f") |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "expecting '}'", |
| [ |
| '''f'{3' f"}"''', # can't concat to get a valid f-string |
| ], |
| ) |
| |
| def test_comments(self): |
| # These aren't comments, since they're in strings. |
| d = {"#": "hash"} |
| self.assertEqual(f'{"#"}', "#") |
| self.assertEqual(f'{d["#"]}', "hash") |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "'{' was never closed", |
| [ |
| "f'{1#}'", # error because everything after '#' is a comment |
| "f'{#}'", |
| "f'one: {1#}'", |
| "f'{1# one} {2 this is a comment still#}'", |
| ], |
| ) |
| self.assertAllRaise( |
| SyntaxError, |
| r"f-string: unmatched '\)'", |
| [ |
| "f'{)#}'", # When wrapped in parens, this becomes |
| # '()#)'. Make sure that doesn't compile. |
| ], |
| ) |
| self.assertEqual( |
| f"""A complex trick: { |
| 2 # two |
| }""", |
| "A complex trick: 2", |
| ) |
| self.assertEqual( |
| f""" |
| { |
| 40 # forty |
| + # plus |
| 2 # two |
| }""", |
| "\n42", |
| ) |
| self.assertEqual( |
| f""" |
| { |
| 40 # forty |
| + # plus |
| 2 # two |
| }""", |
| "\n42", |
| ) |
| |
| self.assertEqual( |
| f""" |
| # this is not a comment |
| { # the following operation it's |
| 3 # this is a number |
| * 2}""", |
| "\n# this is not a comment\n6", |
| ) |
| self.assertEqual( |
| f""" |
| {# f'a {comment}' |
| 86 # constant |
| # nothing more |
| }""", |
| "\n86", |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| r"f-string: valid expression required before '}'", |
| [ |
| """f''' |
| { |
| # only a comment |
| }''' |
| """, # this is equivalent to f'{}' |
| ], |
| ) |
| |
| def test_many_expressions(self): |
| # Create a string with many expressions in it. Note that |
| # because we have a space in here as a literal, we're actually |
| # going to use twice as many ast nodes: one for each literal |
| # plus one for each expression. |
| def build_fstr(n, extra=""): |
| return "f'" + ("{x} " * n) + extra + "'" |
| |
| x = "X" |
| width = 1 |
| |
| # Test around 256. |
| for i in range(250, 260): |
| self.assertEqual(eval(build_fstr(i)), (x + " ") * i) |
| |
| # Test concatenating 2 largs fstrings. |
| self.assertEqual(eval(build_fstr(255) * 256), (x + " ") * (255 * 256)) |
| |
| s = build_fstr(253, "{x:{width}} ") |
| self.assertEqual(eval(s), (x + " ") * 254) |
| |
| # Test lots of expressions and constants, concatenated. |
| s = "f'{1}' 'x' 'y'" * 1024 |
| self.assertEqual(eval(s), "1xy" * 1024) |
| |
| def test_format_specifier_expressions(self): |
| width = 10 |
| precision = 4 |
| value = decimal.Decimal("12.34567") |
| self.assertEqual(f"result: {value:{width}.{precision}}", "result: 12.35") |
| self.assertEqual(f"result: {value:{width!r}.{precision}}", "result: 12.35") |
| self.assertEqual( |
| f"result: {value:{width:0}.{precision:1}}", "result: 12.35" |
| ) |
| self.assertEqual( |
| f"result: {value:{1}{0:0}.{precision:1}}", "result: 12.35" |
| ) |
| self.assertEqual( |
| f"result: {value:{ 1}{ 0:0}.{ precision:1}}", "result: 12.35" |
| ) |
| self.assertEqual(f"{10:#{1}0x}", " 0xa") |
| self.assertEqual(f'{10:{"#"}1{0}{"x"}}', " 0xa") |
| self.assertEqual(f'{-10:-{"#"}1{0}x}', " -0xa") |
| self.assertEqual(f'{-10:{"-"}#{1}0{"x"}}', " -0xa") |
| self.assertEqual(f"{10:#{3 != {4:5} and width}x}", " 0xa") |
| self.assertEqual( |
| f"result: {value:{width:{0}}.{precision:1}}", "result: 12.35" |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting ':' or '}'", |
| [ |
| """f'{"s"!r{":10"}}'""", |
| # This looks like a nested format spec. |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting a valid expression after '{'", |
| [ # Invalid syntax inside a nested spec. |
| "f'{4:{/5}}'", |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: invalid conversion character", |
| [ # No expansion inside conversion or for |
| # the : or ! itself. |
| """f'{"s"!{"r"}}'""", |
| ], |
| ) |
| |
| def test_custom_format_specifier(self): |
| class CustomFormat: |
| def __format__(self, format_spec): |
| return format_spec |
| |
| self.assertEqual(f"{CustomFormat():\n}", "\n") |
| self.assertEqual(f"{CustomFormat():\u2603}", "☃") |
| with self.assertWarns(SyntaxWarning): |
| exec(r'f"{F():¯\_(ツ)_/¯}"', {"F": CustomFormat}) |
| |
| def test_side_effect_order(self): |
| class X: |
| def __init__(self): |
| self.i = 0 |
| |
| def __format__(self, spec): |
| self.i += 1 |
| return str(self.i) |
| |
| x = X() |
| self.assertEqual(f"{x} {x}", "1 2") |
| |
| def test_missing_expression(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: valid expression required before '}'", |
| [ |
| "f'{}'", |
| "f'{ }'" "f' {} '", |
| "f'{10:{ }}'", |
| "f' { } '", |
| # The Python parser ignores also the following |
| # whitespace characters in additional to a space. |
| "f'''{\t\f\r\n}'''", |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: valid expression required before '!'", |
| [ |
| "f'{!r}'", |
| "f'{ !r}'", |
| "f'{!}'", |
| "f'''{\t\f\r\n!a}'''", |
| # Catch empty expression before the |
| # missing closing brace. |
| "f'{!'", |
| "f'{!s:'", |
| # Catch empty expression before the |
| # invalid conversion. |
| "f'{!x}'", |
| "f'{ !xr}'", |
| "f'{!x:}'", |
| "f'{!x:a}'", |
| "f'{ !xr:}'", |
| "f'{ !xr:a}'", |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: valid expression required before ':'", |
| [ |
| "f'{:}'", |
| "f'{ :!}'", |
| "f'{:2}'", |
| "f'''{\t\f\r\n:a}'''", |
| "f'{:'", |
| "F'{[F'{:'}[F'{:'}]]]", |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: valid expression required before '='", |
| [ |
| "f'{=}'", |
| "f'{ =}'", |
| "f'{ =:}'", |
| "f'{ =!}'", |
| "f'''{\t\f\r\n=}'''", |
| "f'{='", |
| ], |
| ) |
| |
| # Different error message is raised for other whitespace characters. |
| self.assertAllRaise( |
| SyntaxError, |
| r"invalid non-printable character U\+00A0", |
| [ |
| "f'''{\xa0}'''", |
| "\xa0", |
| ], |
| ) |
| |
| def test_parens_in_expressions(self): |
| self.assertEqual(f"{3,}", "(3,)") |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting a valid expression after '{'", |
| [ |
| "f'{,}'", |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| r"f-string: unmatched '\)'", |
| [ |
| "f'{3)+(4}'", |
| ], |
| ) |
| |
| def test_newlines_before_syntax_error(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting a valid expression after '{'", |
| ["f'{.}'", "\nf'{.}'", "\n\nf'{.}'"], |
| ) |
| |
| def test_backslashes_in_string_part(self): |
| self.assertEqual(f"\t", "\t") |
| self.assertEqual(r"\t", "\\t") |
| self.assertEqual(rf"\t", "\\t") |
| self.assertEqual(f"{2}\t", "2\t") |
| self.assertEqual(f"{2}\t{3}", "2\t3") |
| self.assertEqual(f"\t{3}", "\t3") |
| |
| self.assertEqual(f"\u0394", "\u0394") |
| self.assertEqual(r"\u0394", "\\u0394") |
| self.assertEqual(rf"\u0394", "\\u0394") |
| self.assertEqual(f"{2}\u0394", "2\u0394") |
| self.assertEqual(f"{2}\u0394{3}", "2\u03943") |
| self.assertEqual(f"\u0394{3}", "\u03943") |
| |
| self.assertEqual(f"\U00000394", "\u0394") |
| self.assertEqual(r"\U00000394", "\\U00000394") |
| self.assertEqual(rf"\U00000394", "\\U00000394") |
| self.assertEqual(f"{2}\U00000394", "2\u0394") |
| self.assertEqual(f"{2}\U00000394{3}", "2\u03943") |
| self.assertEqual(f"\U00000394{3}", "\u03943") |
| |
| self.assertEqual(f"\N{GREEK CAPITAL LETTER DELTA}", "\u0394") |
| self.assertEqual(f"{2}\N{GREEK CAPITAL LETTER DELTA}", "2\u0394") |
| self.assertEqual(f"{2}\N{GREEK CAPITAL LETTER DELTA}{3}", "2\u03943") |
| self.assertEqual(f"\N{GREEK CAPITAL LETTER DELTA}{3}", "\u03943") |
| self.assertEqual(f"2\N{GREEK CAPITAL LETTER DELTA}", "2\u0394") |
| self.assertEqual(f"2\N{GREEK CAPITAL LETTER DELTA}3", "2\u03943") |
| self.assertEqual(f"\N{GREEK CAPITAL LETTER DELTA}3", "\u03943") |
| |
| self.assertEqual(f"\x20", " ") |
| self.assertEqual(r"\x20", "\\x20") |
| self.assertEqual(rf"\x20", "\\x20") |
| self.assertEqual(f"{2}\x20", "2 ") |
| self.assertEqual(f"{2}\x20{3}", "2 3") |
| self.assertEqual(f"\x20{3}", " 3") |
| |
| self.assertEqual(f"2\x20", "2 ") |
| self.assertEqual(f"2\x203", "2 3") |
| self.assertEqual(f"\x203", " 3") |
| |
| with self.assertWarns(SyntaxWarning): # invalid escape sequence |
| value = eval(r"f'\{6*7}'") |
| self.assertEqual(value, "\\42") |
| with self.assertWarns(SyntaxWarning): # invalid escape sequence |
| value = eval(r"f'\g'") |
| self.assertEqual(value, "\\g") |
| self.assertEqual(f"\\{6*7}", "\\42") |
| self.assertEqual(rf"\{6*7}", "\\42") |
| |
| AMPERSAND = "spam" |
| # Get the right unicode character (&), or pick up local variable |
| # depending on the number of backslashes. |
| self.assertEqual(f"\N{AMPERSAND}", "&") |
| self.assertEqual(f"\\N{AMPERSAND}", "\\Nspam") |
| self.assertEqual(rf"\N{AMPERSAND}", "\\Nspam") |
| self.assertEqual(f"\\\N{AMPERSAND}", "\\&") |
| |
| def test_misformed_unicode_character_name(self): |
| # These test are needed because unicode names are parsed |
| # differently inside f-strings. |
| self.assertAllRaise( |
| SyntaxError, |
| r"\(unicode error\) 'unicodeescape' codec can't decode bytes in position .*: malformed \\N character escape", |
| [ |
| r"f'\N'", |
| r"f'\N '", |
| r"f'\N '", # See bpo-46503. |
| r"f'\N{'", |
| r"f'\N{GREEK CAPITAL LETTER DELTA'", |
| # Here are the non-f-string versions, |
| # which should give the same errors. |
| r"'\N'", |
| r"'\N '", |
| r"'\N '", |
| r"'\N{'", |
| r"'\N{GREEK CAPITAL LETTER DELTA'", |
| ], |
| ) |
| |
| def test_backslashes_in_expression_part(self): |
| self.assertEqual( |
| f"{( |
| 1 + |
| 2 |
| )}", |
| "3", |
| ) |
| |
| self.assertEqual("\N{LEFT CURLY BRACKET}", "{") |
| self.assertEqual(f'{"\N{LEFT CURLY BRACKET}"}', "{") |
| self.assertEqual(rf'{"\N{LEFT CURLY BRACKET}"}', "{") |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: valid expression required before '}'", |
| [ |
| "f'{\n}'", |
| ], |
| ) |
| |
| def test_invalid_backslashes_inside_fstring_context(self): |
| # All of these variations are invalid python syntax, |
| # so they are also invalid in f-strings as well. |
| cases = [ |
| formatting.format(expr=expr) |
| for formatting in [ |
| "{expr}", |
| "f'{{{expr}}}'", |
| "rf'{{{expr}}}'", |
| ] |
| for expr in [ |
| r"\'a\'", |
| r"\t3", |
| r"\\"[0], |
| ] |
| ] |
| self.assertAllRaise( |
| SyntaxError, "unexpected character after line continuation", cases |
| ) |
| |
| def test_no_escapes_for_braces(self): |
| """ |
| Only literal curly braces begin an expression. |
| """ |
| # \x7b is '{'. |
| self.assertEqual(f"\x7b1+1}}", "{1+1}") |
| self.assertEqual(f"\x7b1+1", "{1+1") |
| self.assertEqual(f"\u007b1+1", "{1+1") |
| self.assertEqual(f"\N{LEFT CURLY BRACKET}1+1\N{RIGHT CURLY BRACKET}", "{1+1}") |
| |
| def test_newlines_in_expressions(self): |
| self.assertEqual(f"{0}", "0") |
| self.assertEqual( |
| rf"""{3+ |
| 4}""", |
| "7", |
| ) |
| |
| def test_lambda(self): |
| x = 5 |
| self.assertEqual(f'{(lambda y:x*y)("8")!r}', "'88888'") |
| self.assertEqual(f'{(lambda y:x*y)("8")!r:10}', "'88888' ") |
| self.assertEqual(f'{(lambda y:x*y)("8"):10}', "88888 ") |
| |
| # lambda doesn't work without parens, because the colon |
| # makes the parser think it's a format_spec |
| # emit warning if we can match a format_spec |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: lambda expressions are not allowed " "without parentheses", |
| [ |
| "f'{lambda x:x}'", |
| "f'{lambda :x}'", |
| "f'{lambda *arg, :x}'", |
| "f'{1, lambda:x}'", |
| "f'{lambda x:}'", |
| "f'{lambda :}'", |
| ], |
| ) |
| # Ensure the detection of invalid lambdas doesn't trigger detection |
| # for valid lambdas in the second error pass |
| with self.assertRaisesRegex(SyntaxError, "invalid syntax"): |
| compile("lambda name_3=f'{name_4}': {name_3}\n1 $ 1", "<string>", "exec") |
| |
| # but don't emit the paren warning in general cases |
| with self.assertRaisesRegex( |
| SyntaxError, "f-string: expecting a valid expression after '{'" |
| ): |
| eval("f'{+ lambda:None}'") |
| |
| def test_valid_prefixes(self): |
| self.assertEqual(f"{1}", "1") |
| self.assertEqual(Rf"{2}", "2") |
| self.assertEqual(Rf"{3}", "3") |
| |
| def test_roundtrip_raw_quotes(self): |
| self.assertEqual(rf"\'", "\\'") |
| self.assertEqual(rf"\"", '\\"') |
| self.assertEqual(rf"\"\'", "\\\"\\'") |
| self.assertEqual(rf"\'\"", "\\'\\\"") |
| self.assertEqual(rf"\"\'\"", '\\"\\\'\\"') |
| self.assertEqual(rf"\'\"\'", "\\'\\\"\\'") |
| self.assertEqual(rf"\"\'\"\'", "\\\"\\'\\\"\\'") |
| |
| def test_fstring_backslash_before_double_bracket(self): |
| deprecated_cases = [ |
| (r"f'\{{\}}'", "\\{\\}"), |
| (r"f'\{{'", "\\{"), |
| (r"f'\{{{1+1}'", "\\{2"), |
| (r"f'\}}{1+1}'", "\\}2"), |
| (r"f'{1+1}\}}'", "2\\}"), |
| ] |
| for case, expected_result in deprecated_cases: |
| with self.subTest(case=case, expected_result=expected_result): |
| with self.assertWarns(SyntaxWarning): |
| result = eval(case) |
| self.assertEqual(result, expected_result) |
| self.assertEqual(rf"\{{\}}", "\\{\\}") |
| self.assertEqual(rf"\{{", "\\{") |
| self.assertEqual(rf"\{{{1+1}", "\\{2") |
| self.assertEqual(rf"\}}{1+1}", "\\}2") |
| self.assertEqual(rf"{1+1}\}}", "2\\}") |
| |
| def test_fstring_backslash_before_double_bracket_warns_once(self): |
| with self.assertWarns(SyntaxWarning) as w: |
| eval(r"f'\{{'") |
| self.assertEqual(len(w.warnings), 1) |
| self.assertEqual(w.warnings[0].category, SyntaxWarning) |
| |
| def test_fstring_backslash_prefix_raw(self): |
| self.assertEqual(f"\\", "\\") |
| self.assertEqual(f"\\\\", "\\\\") |
| self.assertEqual(rf"\\", r"\\") |
| self.assertEqual(rf"\\\\", r"\\\\") |
| self.assertEqual(rf"\\", r"\\") |
| self.assertEqual(rf"\\\\", r"\\\\") |
| self.assertEqual(Rf"\\", R"\\") |
| self.assertEqual(Rf"\\\\", R"\\\\") |
| self.assertEqual(Rf"\\", R"\\") |
| self.assertEqual(Rf"\\\\", R"\\\\") |
| self.assertEqual(Rf"\\", R"\\") |
| self.assertEqual(Rf"\\\\", R"\\\\") |
| |
| def test_fstring_format_spec_greedy_matching(self): |
| self.assertEqual(f"{1:}}}", "1}") |
| self.assertEqual(f"{1:>3{5}}}}", " 1}") |
| |
| def test_yield(self): |
| # Not terribly useful, but make sure the yield turns |
| # a function into a generator |
| def fn(y): |
| f"y:{yield y*2}" |
| f"{yield}" |
| |
| g = fn(4) |
| self.assertEqual(next(g), 8) |
| self.assertEqual(next(g), None) |
| |
| def test_yield_send(self): |
| def fn(x): |
| yield f"x:{yield (lambda i: x * i)}" |
| |
| g = fn(10) |
| the_lambda = next(g) |
| self.assertEqual(the_lambda(4), 40) |
| self.assertEqual(g.send("string"), "x:string") |
| |
| def test_expressions_with_triple_quoted_strings(self): |
| self.assertEqual(f"{'''x'''}", "x") |
| self.assertEqual(f"{'''eric's'''}", "eric's") |
| |
| # Test concatenation within an expression |
| self.assertEqual(f'{"x" """eric"s""" "y"}', 'xeric"sy') |
| self.assertEqual(f'{"x" """eric"s"""}', 'xeric"s') |
| self.assertEqual(f'{"""eric"s""" "y"}', 'eric"sy') |
| self.assertEqual(f'{"""x""" """eric"s""" "y"}', 'xeric"sy') |
| self.assertEqual(f'{"""x""" """eric"s""" """y"""}', 'xeric"sy') |
| self.assertEqual(f'{r"""x""" """eric"s""" """y"""}', 'xeric"sy') |
| |
| def test_multiple_vars(self): |
| x = 98 |
| y = "abc" |
| self.assertEqual(f"{x}{y}", "98abc") |
| |
| self.assertEqual(f"X{x}{y}", "X98abc") |
| self.assertEqual(f"{x}X{y}", "98Xabc") |
| self.assertEqual(f"{x}{y}X", "98abcX") |
| |
| self.assertEqual(f"X{x}Y{y}", "X98Yabc") |
| self.assertEqual(f"X{x}{y}Y", "X98abcY") |
| self.assertEqual(f"{x}X{y}Y", "98XabcY") |
| |
| self.assertEqual(f"X{x}Y{y}Z", "X98YabcZ") |
| |
| def test_closure(self): |
| def outer(x): |
| def inner(): |
| return f"x:{x}" |
| |
| return inner |
| |
| self.assertEqual(outer("987")(), "x:987") |
| self.assertEqual(outer(7)(), "x:7") |
| |
| def test_arguments(self): |
| y = 2 |
| |
| def f(x, width): |
| return f"x={x*y:{width}}" |
| |
| self.assertEqual(f("foo", 10), "x=foofoo ") |
| x = "bar" |
| self.assertEqual(f(10, 10), "x= 20") |
| |
| def test_locals(self): |
| value = 123 |
| self.assertEqual(f"v:{value}", "v:123") |
| |
| def test_missing_variable(self): |
| with self.assertRaises(NameError): |
| f"v:{value}" |
| |
| def test_missing_format_spec(self): |
| class O: |
| def __format__(self, spec): |
| if not spec: |
| return "*" |
| return spec |
| |
| self.assertEqual(f"{O():x}", "x") |
| self.assertEqual(f"{O()}", "*") |
| self.assertEqual(f"{O():}", "*") |
| |
| self.assertEqual(f"{3:}", "3") |
| self.assertEqual(f"{3!s:}", "3") |
| |
| def test_global(self): |
| self.assertEqual(f"g:{a_global}", "g:global variable") |
| self.assertEqual(f"g:{a_global!r}", "g:'global variable'") |
| |
| a_local = "local variable" |
| self.assertEqual( |
| f"g:{a_global} l:{a_local}", "g:global variable l:local variable" |
| ) |
| self.assertEqual(f"g:{a_global!r}", "g:'global variable'") |
| self.assertEqual( |
| f"g:{a_global} l:{a_local!r}", "g:global variable l:'local variable'" |
| ) |
| |
| self.assertIn("module 'unittest' from", f"{unittest}") |
| |
| def test_shadowed_global(self): |
| a_global = "really a local" |
| self.assertEqual(f"g:{a_global}", "g:really a local") |
| self.assertEqual(f"g:{a_global!r}", "g:'really a local'") |
| |
| a_local = "local variable" |
| self.assertEqual( |
| f"g:{a_global} l:{a_local}", "g:really a local l:local variable" |
| ) |
| self.assertEqual(f"g:{a_global!r}", "g:'really a local'") |
| self.assertEqual( |
| f"g:{a_global} l:{a_local!r}", "g:really a local l:'local variable'" |
| ) |
| |
| def test_call(self): |
| def foo(x): |
| return "x=" + str(x) |
| |
| self.assertEqual(f"{foo(10)}", "x=10") |
| |
| def test_nested_fstrings(self): |
| y = 5 |
| self.assertEqual(f'{f"{0}"*3}', "000") |
| self.assertEqual(f'{f"{y}"*3}', "555") |
| |
| def test_invalid_string_prefixes(self): |
| single_quote_cases = [ |
| "fu''", |
| "uf''", |
| "Fu''", |
| "fU''", |
| "Uf''", |
| "uF''", |
| "ufr''", |
| "urf''", |
| "fur''", |
| "fru''", |
| "rfu''", |
| "ruf''", |
| "FUR''", |
| "Fur''", |
| "fb''", |
| "fB''", |
| "Fb''", |
| "FB''", |
| "bf''", |
| "bF''", |
| "Bf''", |
| "BF''", |
| ] |
| double_quote_cases = [case.replace("'", '"') for case in single_quote_cases] |
| self.assertAllRaise( |
| SyntaxError, "invalid syntax", single_quote_cases + double_quote_cases |
| ) |
| |
| def test_leading_trailing_spaces(self): |
| self.assertEqual(f"{ 3}", "3") |
| self.assertEqual(f"{ 3}", "3") |
| self.assertEqual(f"{3 }", "3") |
| self.assertEqual(f"{3 }", "3") |
| |
| self.assertEqual(f"expr={ {x: y for x, y in [(1, 2), ]}}", "expr={1: 2}") |
| self.assertEqual(f"expr={ {x: y for x, y in [(1, 2), ]} }", "expr={1: 2}") |
| |
| def test_not_equal(self): |
| # There's a special test for this because there's a special |
| # case in the f-string parser to look for != as not ending an |
| # expression. Normally it would, while looking for !s or !r. |
| |
| self.assertEqual(f"{3!=4}", "True") |
| self.assertEqual(f"{3!=4:}", "True") |
| self.assertEqual(f"{3!=4!s}", "True") |
| self.assertEqual(f"{3!=4!s:.3}", "Tru") |
| |
| def test_equal_equal(self): |
| # Because an expression ending in = has special meaning, |
| # there's a special test for ==. Make sure it works. |
| |
| self.assertEqual(f"{0==1}", "False") |
| |
| def test_conversions(self): |
| self.assertEqual(f"{3.14:10.10}", " 3.14") |
| self.assertEqual(f"{3.14!s:10.10}", "3.14 ") |
| self.assertEqual(f"{3.14!r:10.10}", "3.14 ") |
| self.assertEqual(f"{3.14!a:10.10}", "3.14 ") |
| |
| self.assertEqual(f'{"a"}', "a") |
| self.assertEqual(f'{"a"!r}', "'a'") |
| self.assertEqual(f'{"a"!a}', "'a'") |
| |
| # Conversions can have trailing whitespace after them since it |
| # does not provide any significance |
| self.assertEqual(f"{3!s }", "3") |
| self.assertEqual(f"{3.14!s :10.10}", "3.14 ") |
| |
| # Not a conversion. |
| self.assertEqual(f'{"a!r"}', "a!r") |
| |
| # Not a conversion, but show that ! is allowed in a format spec. |
| self.assertEqual(f"{3.14:!<10.10}", "3.14!!!!!!") |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting '}'", |
| [ |
| "f'{3!'", |
| "f'{3!s'", |
| "f'{3!g'", |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: missing conversion character", |
| [ |
| "f'{3!}'", |
| "f'{3!:'", |
| "f'{3!:}'", |
| ], |
| ) |
| |
| for conv_identifier in "g", "A", "G", "ä", "ɐ": |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: invalid conversion character %r: " |
| "expected 's', 'r', or 'a'" % conv_identifier, |
| ["f'{3!" + conv_identifier + "}'"], |
| ) |
| |
| for conv_non_identifier in "3", "!": |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: invalid conversion character", |
| ["f'{3!" + conv_non_identifier + "}'"], |
| ) |
| |
| for conv in " s", " s ": |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: conversion type must come right after the" |
| " exclamanation mark", |
| ["f'{3!" + conv + "}'"], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: invalid conversion character 'ss': " "expected 's', 'r', or 'a'", |
| [ |
| "f'{3!ss}'", |
| "f'{3!ss:}'", |
| "f'{3!ss:s}'", |
| ], |
| ) |
| |
| def test_assignment(self): |
| self.assertAllRaise( |
| SyntaxError, |
| r"invalid syntax", |
| [ |
| "f'' = 3", |
| "f'{0}' = x", |
| "f'{x}' = x", |
| ], |
| ) |
| |
| def test_del(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "invalid syntax", |
| [ |
| "del f''", |
| "del '' f''", |
| ], |
| ) |
| |
| def test_mismatched_braces(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: single '}' is not allowed", |
| [ |
| "f'{{}'", |
| "f'{{}}}'", |
| "f'}'", |
| "f'x}'", |
| "f'x}x'", |
| r"f'\u007b}'", |
| # Can't have { or } in a format spec. |
| "f'{3:}>10}'", |
| "f'{3:}}>10}'", |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting '}'", |
| [ |
| "f'{3'", |
| "f'{3!'", |
| "f'{3:'", |
| "f'{3!s'", |
| "f'{3!s:'", |
| "f'{3!s:3'", |
| "f'x{'", |
| "f'x{x'", |
| "f'{x'", |
| "f'{3:s'", |
| "f'{{{'", |
| "f'{{}}{'", |
| "f'{'", |
| "f'{i='", # See gh-93418. |
| ], |
| ) |
| |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting a valid expression after '{'", |
| [ |
| "f'{3:{{>10}'", |
| ], |
| ) |
| |
| # But these are just normal strings. |
| self.assertEqual(f'{"{"}', "{") |
| self.assertEqual(f'{"}"}', "}") |
| self.assertEqual(f'{3:{"}"}>10}', "}}}}}}}}}3") |
| self.assertEqual(f'{2:{"{"}>10}', "{{{{{{{{{2") |
| |
| def test_if_conditional(self): |
| # There's special logic in compile.c to test if the |
| # conditional for an if (and while) are constants. Exercise |
| # that code. |
| |
| def test_fstring(x, expected): |
| flag = 0 |
| if f"{x}": |
| flag = 1 |
| else: |
| flag = 2 |
| self.assertEqual(flag, expected) |
| |
| def test_concat_empty(x, expected): |
| flag = 0 |
| if "" f"{x}": |
| flag = 1 |
| else: |
| flag = 2 |
| self.assertEqual(flag, expected) |
| |
| def test_concat_non_empty(x, expected): |
| flag = 0 |
| if " " f"{x}": |
| flag = 1 |
| else: |
| flag = 2 |
| self.assertEqual(flag, expected) |
| |
| test_fstring("", 2) |
| test_fstring(" ", 1) |
| |
| test_concat_empty("", 2) |
| test_concat_empty(" ", 1) |
| |
| test_concat_non_empty("", 1) |
| test_concat_non_empty(" ", 1) |
| |
| def test_empty_format_specifier(self): |
| x = "test" |
| self.assertEqual(f"{x}", "test") |
| self.assertEqual(f"{x:}", "test") |
| self.assertEqual(f"{x!s:}", "test") |
| self.assertEqual(f"{x!r:}", "'test'") |
| |
| def test_str_format_differences(self): |
| d = { |
| "a": "string", |
| 0: "integer", |
| } |
| a = 0 |
| self.assertEqual(f"{d[0]}", "integer") |
| self.assertEqual(f'{d["a"]}', "string") |
| self.assertEqual(f"{d[a]}", "integer") |
| self.assertEqual("{d[a]}".format(d=d), "string") |
| self.assertEqual("{d[0]}".format(d=d), "integer") |
| |
| def test_errors(self): |
| # see issue 26287 |
| self.assertAllRaise( |
| TypeError, |
| "unsupported", |
| [ |
| r"f'{(lambda: 0):x}'", |
| r"f'{(0,):x}'", |
| ], |
| ) |
| self.assertAllRaise( |
| ValueError, |
| "Unknown format code", |
| [ |
| r"f'{1000:j}'", |
| r"f'{1000:j}'", |
| ], |
| ) |
| |
| def test_filename_in_syntaxerror(self): |
| # see issue 38964 |
| with temp_cwd() as cwd: |
| file_path = os.path.join(cwd, "t.py") |
| with open(file_path, "w", encoding="utf-8") as f: |
| f.write('f"{a b}"') # This generates a SyntaxError |
| _, _, stderr = assert_python_failure(file_path, PYTHONIOENCODING="ascii") |
| self.assertIn(file_path.encode("ascii", "backslashreplace"), stderr) |
| |
| def test_loop(self): |
| for i in range(1000): |
| self.assertEqual(f"i:{i}", "i:" + str(i)) |
| |
| def test_dict(self): |
| d = { |
| '"': "dquote", |
| "'": "squote", |
| "foo": "bar", |
| } |
| self.assertEqual(f"""{d["'"]}""", "squote") |
| self.assertEqual(f"""{d['"']}""", "dquote") |
| |
| self.assertEqual(f'{d["foo"]}', "bar") |
| self.assertEqual(f"{d['foo']}", "bar") |
| |
| def test_backslash_char(self): |
| # Check eval of a backslash followed by a control char. |
| # See bpo-30682: this used to raise an assert in pydebug mode. |
| self.assertEqual(eval('f"\\\n"'), "") |
| self.assertEqual(eval('f"\\\r"'), "") |
| |
| def test_debug_conversion(self): |
| x = "A string" |
| self.assertEqual(f"{x=}", "x=" + repr(x)) |
| self.assertEqual(f"{x =}", "x =" + repr(x)) |
| self.assertEqual(f"{x=!s}", "x=" + str(x)) |
| self.assertEqual(f"{x=!r}", "x=" + repr(x)) |
| self.assertEqual(f"{x=!a}", "x=" + ascii(x)) |
| |
| x = 2.71828 |
| self.assertEqual(f"{x=:.2f}", "x=" + format(x, ".2f")) |
| self.assertEqual(f"{x=:}", "x=" + format(x, "")) |
| self.assertEqual(f"{x=!r:^20}", "x=" + format(repr(x), "^20")) |
| self.assertEqual(f"{x=!s:^20}", "x=" + format(str(x), "^20")) |
| self.assertEqual(f"{x=!a:^20}", "x=" + format(ascii(x), "^20")) |
| |
| x = 9 |
| self.assertEqual(f"{3*x+15=}", "3*x+15=42") |
| |
| # There is code in ast.c that deals with non-ascii expression values. So, |
| # use a unicode identifier to trigger that. |
| tenπ = 31.4 |
| self.assertEqual(f"{tenπ=:.2f}", "tenπ=31.40") |
| |
| # Also test with Unicode in non-identifiers. |
| self.assertEqual(f'{"Σ"=}', "\"Σ\"='Σ'") |
| |
| # Make sure nested fstrings still work. |
| self.assertEqual(f'{f"{3.1415=:.1f}":*^20}', "*****3.1415=3.1*****") |
| |
| # Make sure text before and after an expression with = works |
| # correctly. |
| pi = "π" |
| self.assertEqual(f"alpha α {pi=} ω omega", "alpha α pi='π' ω omega") |
| |
| # Check multi-line expressions. |
| self.assertEqual( |
| f"""{ |
| 3 |
| =}""", |
| "\n3\n=3", |
| ) |
| |
| # Since = is handled specially, make sure all existing uses of |
| # it still work. |
| |
| self.assertEqual(f"{0==1}", "False") |
| self.assertEqual(f"{0!=1}", "True") |
| self.assertEqual(f"{0<=1}", "True") |
| self.assertEqual(f"{0>=1}", "False") |
| self.assertEqual(f'{(x:="5")}', "5") |
| self.assertEqual(x, "5") |
| self.assertEqual(f"{(x:=5)}", "5") |
| self.assertEqual(x, 5) |
| self.assertEqual(f'{"="}', "=") |
| |
| x = 20 |
| # This isn't an assignment expression, it's 'x', with a format |
| # spec of '=10'. See test_walrus: you need to use parens. |
| self.assertEqual(f"{x:=10}", " 20") |
| |
| # Test named function parameters, to make sure '=' parsing works |
| # there. |
| def f(a): |
| nonlocal x |
| oldx = x |
| x = a |
| return oldx |
| |
| x = 0 |
| self.assertEqual(f'{f(a="3=")}', "0") |
| self.assertEqual(x, "3=") |
| self.assertEqual(f"{f(a=4)}", "3=") |
| self.assertEqual(x, 4) |
| |
| # Check debug expressions in format spec |
| y = 20 |
| self.assertEqual(f"{2:{y=}}", "yyyyyyyyyyyyyyyyyyy2") |
| self.assertEqual( |
| f"{datetime.datetime.now():h1{y=}h2{y=}h3{y=}}", "h1y=20h2y=20h3y=20" |
| ) |
| |
| # Make sure __format__ is being called. |
| class C: |
| def __format__(self, s): |
| return f"FORMAT-{s}" |
| |
| def __repr__(self): |
| return "REPR" |
| |
| self.assertEqual(f"{C()=}", "C()=REPR") |
| self.assertEqual(f"{C()=!r}", "C()=REPR") |
| self.assertEqual(f"{C()=:}", "C()=FORMAT-") |
| self.assertEqual(f"{C()=: }", "C()=FORMAT- ") |
| self.assertEqual(f"{C()=:x}", "C()=FORMAT-x") |
| self.assertEqual(f"{C()=!r:*^20}", "C()=********REPR********") |
| self.assertEqual(f"{C():{20=}}", "FORMAT-20=20") |
| |
| self.assertRaises(SyntaxError, eval, "f'{C=]'") |
| |
| # Make sure leading and following text works. |
| x = "foo" |
| self.assertEqual(f"X{x=}Y", "Xx=" + repr(x) + "Y") |
| |
| # Make sure whitespace around the = works. |
| self.assertEqual(f"X{x =}Y", "Xx =" + repr(x) + "Y") |
| self.assertEqual(f"X{x= }Y", "Xx= " + repr(x) + "Y") |
| self.assertEqual(f"X{x = }Y", "Xx = " + repr(x) + "Y") |
| self.assertEqual(f"sadsd {1 + 1 = :{1 + 1:1d}f}", "sadsd 1 + 1 = 2.000000") |
| |
| self.assertEqual( |
| f"{1+2 = # my comment |
| }", |
| "1+2 = \n 3", |
| ) |
| |
| # These next lines contains tabs. Backslash escapes don't |
| # work in f-strings. |
| # patchcheck doesn't like these tabs. So the only way to test |
| # this will be to dynamically created and exec the f-strings. But |
| # that's such a hassle I'll save it for another day. For now, convert |
| # the tabs to spaces just to shut up patchcheck. |
| # self.assertEqual(f'X{x =}Y', 'Xx\t='+repr(x)+'Y') |
| # self.assertEqual(f'X{x = }Y', 'Xx\t=\t'+repr(x)+'Y') |
| |
| def test_debug_expressions_are_raw_strings(self): |
| |
| self.assertEqual(f'{b"\N{OX}"=}', 'b"\\N{OX}"=b\'\\\\N{OX}\'') |
| self.assertEqual(f'{r"\xff"=}', 'r"\\xff"=\'\\\\xff\'') |
| self.assertEqual(f'{r"\n"=}', 'r"\\n"=\'\\\\n\'') |
| self.assertEqual(f"{'\''=}", "'\\''=\"'\"") |
| self.assertEqual(f'{'\xc5'=}', r"'\xc5'='Å'") |
| |
| def test_walrus(self): |
| x = 20 |
| # This isn't an assignment expression, it's 'x', with a format |
| # spec of '=10'. |
| self.assertEqual(f"{x:=10}", " 20") |
| |
| # This is an assignment expression, which requires parens. |
| self.assertEqual(f"{(x:=10)}", "10") |
| self.assertEqual(x, 10) |
| |
| def test_invalid_syntax_error_message(self): |
| with self.assertRaisesRegex( |
| SyntaxError, "f-string: expecting '=', or '!', or ':', or '}'" |
| ): |
| compile("f'{a $ b}'", "?", "exec") |
| |
| def test_with_two_commas_in_format_specifier(self): |
| error_msg = re.escape("Cannot specify ',' with ','.") |
| with self.assertRaisesRegex(ValueError, error_msg): |
| f"{1:,,}" |
| |
| def test_with_two_underscore_in_format_specifier(self): |
| error_msg = re.escape("Cannot specify '_' with '_'.") |
| with self.assertRaisesRegex(ValueError, error_msg): |
| f"{1:__}" |
| |
| def test_with_a_commas_and_an_underscore_in_format_specifier(self): |
| error_msg = re.escape("Cannot specify both ',' and '_'.") |
| with self.assertRaisesRegex(ValueError, error_msg): |
| f"{1:,_}" |
| |
| def test_with_an_underscore_and_a_comma_in_format_specifier(self): |
| error_msg = re.escape("Cannot specify both ',' and '_'.") |
| with self.assertRaisesRegex(ValueError, error_msg): |
| f"{1:_,}" |
| |
| def test_syntax_error_for_starred_expressions(self): |
| with self.assertRaisesRegex(SyntaxError, "can't use starred expression here"): |
| compile("f'{*a}'", "?", "exec") |
| |
| with self.assertRaisesRegex( |
| SyntaxError, "f-string: expecting a valid expression after '{'" |
| ): |
| compile("f'{**a}'", "?", "exec") |
| |
| def test_not_closing_quotes(self): |
| self.assertAllRaise(SyntaxError, "unterminated f-string literal", ['f"', "f'"]) |
| self.assertAllRaise( |
| SyntaxError, "unterminated triple-quoted f-string literal", ['f"""', "f'''"] |
| ) |
| # Ensure that the errors are reported at the correct line number. |
| data = '''\ |
| x = 1 + 1 |
| y = 2 + 2 |
| z = f""" |
| sdfjnsdfjsdf |
| sdfsdfs{1+ |
| 2} dfigdf {3+ |
| 4}sdufsd"" |
| ''' |
| try: |
| compile(data, "?", "exec") |
| except SyntaxError as e: |
| self.assertEqual(e.text, 'z = f"""') |
| self.assertEqual(e.lineno, 3) |
| |
| def test_syntax_error_after_debug(self): |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting a valid expression after '{'", |
| [ |
| "f'{1=}{;'", |
| "f'{1=}{+;'", |
| "f'{1=}{2}{;'", |
| "f'{1=}{3}{;'", |
| ], |
| ) |
| self.assertAllRaise( |
| SyntaxError, |
| "f-string: expecting '=', or '!', or ':', or '}'", |
| [ |
| "f'{1=}{1;'", |
| "f'{1=}{1;}'", |
| ], |
| ) |
| |
| def test_debug_in_file(self): |
| with temp_cwd(): |
| script = "script.py" |
| with open("script.py", "w") as f: |
| f.write(f"""\ |
| print(f'''{{ |
| 3 |
| =}}''')""") |
| |
| _, stdout, _ = assert_python_ok(script) |
| self.assertEqual( |
| stdout.decode("utf-8").strip().replace("\r\n", "\n").replace("\r", "\n"), |
| "3\n=3", |
| ) |
| |
| def test_syntax_warning_infinite_recursion_in_file(self): |
| with temp_cwd(): |
| script = "script.py" |
| with open(script, "w") as f: |
| f.write(r"print(f'\{1}')") |
| |
| _, stdout, stderr = assert_python_ok(script) |
| self.assertIn(rb"\1", stdout) |
| self.assertEqual(len(stderr.strip().splitlines()), 2) |
| |
| def test_gh129093(self): |
| self.assertEqual(f'{1==2=}', '1==2=False') |
| self.assertEqual(f'{1 == 2=}', '1 == 2=False') |
| self.assertEqual(f'{1!=2=}', '1!=2=True') |
| self.assertEqual(f'{1 != 2=}', '1 != 2=True') |
| |
| self.assertEqual(f'{(1) != 2=}', '(1) != 2=True') |
| self.assertEqual(f'{(1*2) != (3)=}', '(1*2) != (3)=True') |
| |
| self.assertEqual(f'{1 != 2 == 3 != 4=}', '1 != 2 == 3 != 4=False') |
| self.assertEqual(f'{1 == 2 != 3 == 4=}', '1 == 2 != 3 == 4=False') |
| |
| self.assertEqual(f'{f'{1==2=}'=}', "f'{1==2=}'='1==2=False'") |
| self.assertEqual(f'{f'{1 == 2=}'=}', "f'{1 == 2=}'='1 == 2=False'") |
| self.assertEqual(f'{f'{1!=2=}'=}', "f'{1!=2=}'='1!=2=True'") |
| self.assertEqual(f'{f'{1 != 2=}'=}', "f'{1 != 2=}'='1 != 2=True'") |
| |
| |
| if __name__ == "__main__": |
| |
| unittest.main() |
