0(1) element: null
1(2) element: PyTryExceptStatement
2(3,5) element: PyTryPart
3(4,5) element: PyRaiseStatement
4(5,11) READ ACCESS: Exception
5(6) element: PyExceptPart
6(7) element: PyAssignmentStatement
7(8) READ ACCESS: Exception
8(9) WRITE ACCESS: foo
9(10) element: PyRaiseStatement
10(11) READ ACCESS: foo
11() element: null