0(1) element: null
1(2) element: PyImportStatement
2(3) WRITE ACCESS: sys
3(4) element: PyForStatement
4(5) element: PyTargetExpression: s
5(6) WRITE ACCESS: s
6(7) element: PyIfStatement
7(8) READ ACCESS: len
8(9,11) READ ACCESS: s
9(10) element: PyStatementList. Condition: len(s) == 1:true
10(3,13) element: PyContinueStatement
11(12) element: PyExpressionStatement
12(15) READ ACCESS: sys
13(14) element: PyRaiseStatement
14(15) READ ACCESS: Exception
15() element: null