0(1) element: null
1(2) element: PyClass: Foo
2(3) WRITE ACCESS: Foo
3(4) element: PyClass: Bar
4(5) READ ACCESS: Foo
5(6) WRITE ACCESS: Bar
6(7) element: PyExpressionStatement
7(8) READ ACCESS: Bar
8(9) element: PyCallExpression: Bar
9() element: null