PyFile:QualifiedTarget.py
  PyAssignmentStatement
    PyTargetExpression: b
      PyReferenceExpression: a
        PsiElement(Py:IDENTIFIER)('a')
      PsiElement(Py:DOT)('.')
      PsiElement(Py:IDENTIFIER)('b')
    PsiWhiteSpace(' ')
    PsiElement(Py:EQ)('=')
    PsiWhiteSpace(' ')
    PyNumericLiteralExpression
      PsiElement(Py:INTEGER_LITERAL)('23')