Serhiy Storchaka added the comment:
Here is patch for 3.3 which adds alternative parameter name. Now both keyword
names are allowed, but deprecation warning is emitted if old keyword name is
used.
>>> import re
>>> p = re.compile('')
>>> p.match()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Required argument 'string' (pos 1) not found
>>> p.match('')
<_sre.SRE_Match object at 0xb705c598>
>>> p.match(string='')
<_sre.SRE_Match object at 0xb705c720>
>>> p.match(pattern='')
__main__:1: DeprecationWarning: The 'pattern' keyword parameter name is
deprecated. Use 'string' instead.
<_sre.SRE_Match object at 0xb705c758>
>>> p.match('', string='')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Argument given by name ('string') and position (1)
>>> p.match('', pattern='')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Argument given by name ('pattern') and position (1)
----------
Added file: http://bugs.python.org/file33705/sre_deprecate_pattern_keyword.patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20283>
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