Fix tests failures in ast_test.py

[razajafri]

These are the failures in ast_test.py

FAILED ../../../../integration_tests/src/main/python/ast_test.py::test_abs
FAILED ../../../../integration_tests/src/main/python/ast_test.py::test_addition
FAILED ../../../../integration_tests/src/main/python/ast_test.py::test_multi_tier_ast
FAILED ../../../../integration_tests/src/main/python/ast_test.py::test_multiplication
FAILED ../../../../integration_tests/src/main/python/ast_test.py::test_subtraction
FAILED ../../../../integration_tests/src/main/python/ast_test.py::test_unary_minus

[razajafri]

These will be all fixed by turning off ansi mode

[razajafri]

Closed by #11258