python - Unable to import a module that is definitely installed

Question

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 1

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