0(1) element: null
1(2) element: PyIfStatement
2(3) READ ACCESS: isinstance
3(4) READ ACCESS: x
4(5) READ ACCESS: str
5(6,18) element: PyCallExpression: isinstance
6(7) element: PyStatementList. Condition: not isinstance(x, str):true
7(8) ASSERTTYPE ACCESS: x
8(9) element: PyIfStatement
9(10) READ ACCESS: x
10(11,15) READ ACCESS: None
11(12) element: PyStatementList. Condition: x is None:true
12(13) ASSERTTYPE ACCESS: x
13(14) element: PyPrintStatement
14(16) READ ACCESS: x
15(16) ASSERTTYPE ACCESS: x
16(17) element: PyPrintStatement
17(19) READ ACCESS: x
18(19) ASSERTTYPE ACCESS: x
19(20) element: PyPrintStatement
20(21) READ ACCESS: x
21() element: null