"python setup.py egg_info" failed with error code 1

I met the same problem when install matplotlib and following command workd:

pip install --upgrade setuptools

pip install ez_setup

Ref here

Worked for me:

easy_install distribute
pip install --upgrade distribute

Try installing python-dev, libpython-dev, libevent-dev and try again...

I ran into a similar problem when trying to run PostgreSQL in a Alpine Docker container.
Apparently some base libraries are not included in the Alpine image for psycopg2 to work properly and therefore need to be installed separately on the image. For me the problem was resolved by adding the following line to my Dockerfile:

RUN apk update && apk add postgresql-dev gcc python3-dev musl-dev