PyPI install fails without first updating pip

[DanielSank]

I made a virtualenv and did this

pip install --pre openfermion

and got

...
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /usr/local/google/home/danielsank/.virtualenvs/openfermion/build/h5py
Traceback (most recent call last):
  File "/usr/local/google/home/danielsank/.virtualenvs/openfermion/bin/pip", line 11, in <module>
    sys.exit(main())
  File "/usr/local/google/home/danielsank/.virtualenvs/openfermion/local/lib/python2.7/site-packages/pip/__init__.py", line 185, in main
    return command.main(cmd_args)
  File "/usr/local/google/home/danielsank/.virtualenvs/openfermion/local/lib/python2.7/site-packages/pip/basecommand.py", line 161, in main
    text = '\n'.join(complete_log)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 72: ordinal not in range(128)

This was with python 2.7.6 and pip 1.5.4.

[DanielSank]

Aha, upgrading to pip 9.0.1 fixed the problem. I should have known as I've seen this problem before. It's not this project's job to fix pip, but this problem happens all the time so we might want to add something to the README.

[DanielSank]

My recommended installation for people who use virtualenv would be (after activating your virtualenv):

pip install -U pip
pip install --pre openfermion