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Not `all` nor `any`. Just `one`.
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def one(iterable): | |
"""Return the object in the given iterable that evaluates to True. | |
If the given iterable has more than one object that evaluates to True, | |
or if there is no object that fulfills such condition, return False. | |
>>> one((True, False, False)) | |
True | |
>>> one((True, False, True)) | |
False | |
>>> one((0, 0, 'a')) | |
'a' | |
>>> one((0, False, None)) | |
False | |
>>> one((True, True)) | |
False | |
>>> bool(one(('', 1))) | |
True | |
License: BSD | |
""" | |
iterable = iter(iterable) | |
for item in iterable: | |
if item: | |
break | |
else: | |
return False | |
if any(iterable): | |
return False | |
return item | |
if __name__ == "__main__": | |
import doctest | |
doctest.testmod() |
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Use case example