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Python coalesce
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def coalesce(*args): | |
"""Returns the first not None/Empty/False item. Similar to ?? in C#. | |
It's different from a or b, where false values are invalid. | |
:param args: list of items for checking | |
:return the first not None item, or None | |
""" | |
out = None #default return value | |
for arg in args: | |
if arg: #find first non-falsey argument | |
out = arg | |
break #short circuit, stop checking at first truthy | |
return out | |
assert ( coalesce(None, '', '', 'test') == 'test') | |
assert ( coalesce(None, 'test') == 'test') | |
assert ( coalesce(1, 'test') == 1) | |
assert ( coalesce('test', None ) == 'test') | |
assert ( coalesce('test', '' ) == 'test') | |
assert ( coalesce('test', None, '') == 'test') |
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