0(1) element: null
1(2) element: PyAssignmentStatement
2(3) WRITE ACCESS: x
3(4) element: PyAssignmentStatement
4(5) WRITE ACCESS: y
5(6) element: PyAssignmentStatement
6(7) READ ACCESS: True
7(8) WRITE ACCESS: c
8(9) element: PyAssignmentStatement
9(10) element: PyConditionalExpression
10(11,12) READ ACCESS: c
11(13) READ ACCESS: x
12(13) READ ACCESS: y
13(14) WRITE ACCESS: z
14() element: null