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- from sympy.core.rules import Transform
- from sympy.testing.pytest import raises
- def test_Transform():
- add1 = Transform(lambda x: x + 1, lambda x: x % 2 == 1)
- assert add1[1] == 2
- assert (1 in add1) is True
- assert add1.get(1) == 2
- raises(KeyError, lambda: add1[2])
- assert (2 in add1) is False
- assert add1.get(2) is None
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