0(1) element: null
1(2) element: PyMatchStatement
2(3) WRITE ACCESS: x
3(4) element: PyBinaryExpression
4(5,6) READ ACCESS: x
5(10) element: null. Condition: x > 0:true
6(7) element: null. Condition: x > 0:false
7(8,9) READ ACCESS: x
8(13) element: null. Condition: x < 0:false
9(10) element: null. Condition: x < 0:true
10(11) element: PyStatementList. Condition: x > 0 or x < 0:true
11(12) element: PyExpressionStatement
12(13) READ ACCESS: y
13(14) element: PyExpressionStatement
14(15) READ ACCESS: z
15() element: null