Unable to import a module that is definitely installed

After installing mechanize, I don’t seem to be able to import it.

I have tried installing from pip, easy_install, and via python setup.py install from this repo: https://github.com/abielr/mechanize. All of this to no avail, as each time I enter my Python interactive I get:

Python 2.7.3 (default, Aug  1 2012, 05:14:39) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import mechanize
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named mechanize
>>>

The installations I ran previously reported that they had completed successfully, so I expect the import to work. What could be causing this error?

Answer

In my case, it is permission problem. The package was somehow installed with root rw permission only, other user just cannot rw to it!

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Answer