[Python-bugs-list] [ python-Bugs-796149 ] _strptime mishandling parentheses in format

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Bugs item #796149, was opened at 2003-08-27 11:03
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=796149&group_id=5470

Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Josh Hoyt (joshhoyt)
Assigned to: Nobody/Anonymous (nobody)
Summary: _strptime mishandling parentheses in format

Initial Comment:
If parentheses are included in a format string, the
format string will not match.

e.g.

>>> time.strptime('(5)', '(%d)')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.3/_strptime.py", line 424, in
strptime
    raise ValueError("time data did not match format: 
data=%s  fmt=%s" %
ValueError: time data did not match format:  data=(5) 
fmt=(%d)

Even worse:

>>> time.strptime('(5)', '(%d)')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.3/_strptime.py", line 420, in
strptime
    format_regex = _locale_cache.compile(format)
  File "/usr/lib/python2.3/_strptime.py", line 398, in
compile
    return re_compile(self.pattern(format), IGNORECASE)
  File "/usr/lib/python2.3/sre.py", line 179, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python2.3/sre.py", line 229, in _compile
    raise error, v # invalid expression
sre_constants.error: unbalanced parenthesis

It looks like parentheses need to be escaped before the
format string is processed.

In Python 2.3.0 _strptime.py:
384c384
<         regex_chars = re_compile(r"([\.^$*+?{}\[\]|])")
---
>         regex_chars =
re_compile(r"([()\.^$*+?{}\[\]|])")

seemed to fix the problem.

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