import itertools
print itertools#ok
the code is ok
but i can't find the itertools file.
who can tell me where is the 'itertools file'
my code is run python2.5
import itertools
print itertools.__file__
Traceback (most recent call last):
File "D:\zjm_code\mysite\zjmbooks\a.py", line 5, in <module>
print itertools.__file__
AttributeError: 'module' object has no attribute '__file__'
Answer
>>> import itertools
>>> itertools.__file__
'/usr/lib64/python2.6/lib-dynload/itertools.so'
The fact that the filename ends with .so means it's an extension module written in C (rather than a normal Python module). If you want to take a look at the source code, download the Python source and look into Modules/itertoolsmodule.c (you can also view it in your browser at http://svn.python.org/view/python/trunk/Modules/itertoolsmodule.c?view=log).
Edit (as an answer to the comment below): it also works with Python 2.5:
Python 2.5.2 (r252:60911, Oct 5 2008, 19:29:17)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import itertools
>>> itertools.__file__
'/usr/lib/python2.5/lib-dynload/itertools.so'