0(1) element: null
1(2) element: PyAssignmentStatement
2(3) WRITE ACCESS: sibling
3(4) element: PyIfStatement
4(5,10) READ ACCESS: sibling
5(6) element: PyStatementList. Condition: sibling:true
6(7) ASSERTTYPE ACCESS: sibling
7(8) element: PyAssignmentStatement
8(9) element: PySubscriptionExpression
9(10) READ ACCESS: sibling
10() element: null