STINNER Victor added the comment:
I suggest to make the 2 last parameters of re.sub(), re.subn() and re.split()
parameters as keyword-only. It will break applications using count and maxsplit
parameters as index parameters, but it's easy to fix these applications if they
want to support also Python 3.5.
I checked Python 2.6: the name of the maxsplit and count parameters didn't
change. So it's possible to write code working on Python 2.6-3.5 if the
parameter name is explicitly used:
* re.sub("a", "a", "a", count=1)
* re.subn("a", "a", "a", count=1)
* re.split("a", "a", maxsplit=1)
The flags parameter was added to re.sub(), re.subn() and re.split() functions
in Python 2.7:
* https://docs.python.org/2.7/library/re.html#re.sub
* https://docs.python.org/2.7/library/re.html#re.subn
* https://docs.python.org/2.7/library/re.html#re.split
See my attached re_keyword_only.patch:
* sub(), subn(): count and flags become keyword-only parameters
* split(): maxsplit and flags become keyword-only parameters
----------
keywords: +patch
nosy: +haypo
Added file: http://bugs.python.org/file37067/re_keyword_only.patch
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