Trigger install on centos7

[Yogesh Gawankar]

I tried pip install trigger but it throws error

command setiup.py egg.info failed with error code 1

install_requires must be a string or list of strings contaning valid project specifiers

Centos 7 comes with python 2.7.5 and I installed pip from epel repo.pip version. It later upgraded to pip 9.0.1


What can I  try next? I could not find any relavent articles on google.