There is one time I tried to install some python package via pip install requirement. But I encountered some error like this:
from pkg_resources import load_entry_point
ImportError: No module named pkg_resources
To fix the issue, run the setup script for setuptools:
wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py -O - | python
Yeah. it solve my problem. Probably. XD
Credit:
http://stackoverflow.com/questions/7446187/no-module-named-pkg-resources