[python] "pip install unroll": "python setup.py egg_info" failed with error code 1

I had this problem using virtualenvs (with pipenv) on my new development setup.

I could only solve it by upgrading the psycopg2 version from 2.6.2 to 2.7.3. More information is at https://github.com/psycopg/psycopg2/issues/594

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