Weird python behavior

[Forafo San]

Hello All,
I'm running Python version 2.7.3_6 on a FreeBSD system. The following session in a Python interpreter throws a mysterious TypeError:

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[ppvora at snowfall ~/xbrl]$ python 
Python 2.7.3 (default, Apr 22 2013, 18:42:18) 
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
Type "help", "copyright", "credits" or "license" for more information.
>>> import glob
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "glob.py", line 14, in <module>
    myl = glob.glob('data/*.xml')
TypeError: 'module' object is not callable
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The file glob.py that the error refers to was run under another screen session. It's a mystery why even that program threw an error. Regardless, why should that session throw an import error in this session? Weird. Any help is appreciated. Thanks,
-Premal