Trying to import passlib into python3 and it fails:
$ pip freeze | grep lib
passlib==1.6.5
$ python3
Python 3.4.2 (default, Oct 8 2014, 10:45:20)
>>> import passlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named 'passlib'
pip
will install a library for python 2. If you want to install it for python 3 too, you must do so separately:
$ python3 -m pip install passlib