I noticed on this page https://anaconda.org/pypi/urllib3 that the pip command to install the package was slightly different than normal:
pip install -i https://pypi.anaconda.org/pypi/simple urllib3
Digging a bit through pip's help I figured out the following which basically says that things are usually installed from https://pypi.python.org/simple.
Why is there a separate Python repository that Anaconda uses? I would've expected that you simply pip install anything but this seems to suggest there is a level of choice between the following two.
- https://pypi.python.org/simple
https://pypi.anaconda.org/pypi/simple
Package Index Options (including deprecated options): -i, --index-url Base URL of Python Package Index (default https://pypi.python.org/simple). This should point to a repository compliant with PEP 503 (the simple repository API) or a local directory laid out in the same format.