How to use 'python assert not none' in Python

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47def assert_is_none(a, msg=None):
48 msg = msg or '{0!r} is not None'.format(a)
49 old_assert_true(a is None, msg)
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25def assert_is_none(x):
26 if x is not None:
27 raise AssertionError("'{}' is not none".format(x))

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