This is somewhat Python-based, but I feel it is more a Bitcoin question than a Python question.
It seems that on PyPi the name
bitcoinis free but... (the) ...
python-bitcoinlibpackage on installation uses the same name "bitcoin" as the current
pybitcointools, and I've had them clash (one overwrote the other)
It's also worth noting that using pip,
pip install pybitcointools = version 1.1.15, whereas
pip install bitcoin = version 1.1.25 (newer version).
I generally prefer Python 2.7 but whatever solutions may be applicable just to Python 3.x would also be greatly appreciated, as using both libraries concurrently would be great.