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Date: Sat, 16 Feb 2013 23:34:57 -0700
Subject: Comparing types
From: Jason Friedman <jsf80238@gmail.com>
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Xref: csiph.com comp.lang.python:39014

I want to tell whether an object is a regular expression pattern.

Python 3.2.3 (default, Oct 19 2012, 20:10:41)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> s = "hello"
>>> type(s)
<class 'str'>
>>> isinstance(s, str)
True
>>> my_pattern = re.compile(s)
>>> type(my_pattern)
<class '_sre.SRE_Pattern'>
>>> isinstance(my_pattern, _sre.SRE_Pattern)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name '_sre' is not defined