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check-commit: allow foo_bar naming in functions...
check-commit: allow foo_bar naming in functions nameswithallthewordssmashedtogetherarehardtoread. especiallyifenglishisnotyourprimarylanguage. Let's align with the rest of the programming universe and allow_the_use_of_underscores_in_names. We took a hand poll at the 5.2 sprint regarding this change and all but 1 person supported it. The person who didn't expressed concerns around excessive API breakage if we mass renamed things. But we're not planning to mass rename things for the sake of renaming, so all should be well. Differential Revision: https://phab.mercurial-scm.org/D2010

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converters.py
24 lines | 531 B | text/x-python | PythonLexer
"""
Commonly useful converters.
"""
from __future__ import absolute_import, division, print_function
def optional(converter):
"""
A converter that allows an attribute to be optional. An optional attribute
is one which can be set to ``None``.
:param callable converter: the converter that is used for non-``None``
values.
.. versionadded:: 17.1.0
"""
def optional_converter(val):
if val is None:
return None
return converter(val)
return optional_converter