Modules are installed using pip on OSX but not found when importing

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Here the answer that worked, which is basically what has been explained in the comments of the question. However, I thought it would be useful to have it explained as a clear and well structured answer.

As highlighted, the problem was that I was not using the interpreter that pip was installing for.
The command which shows where pip was installing the modules:

$ which -a pip
/usr/local/bin/pip

and where the different python versions were located:

$ which -a python
/usr/bin/python
/usr/local/bin/python

That is, my system/default python was

/usr/bin/python

while pip was installing for

/usr/local/bin/python

Therefore, I could not import anything I installed when I just typed python, because the /usr/bin/python interpreter was the one started.

Solution

Install pip again specifying the destination of the modules that will be installed. This must be the destination for the system/default python.

This has been done in two steps:

  1. Downloding get-pip.py from bootstrap.pypa.io/get-pip.py. (You may need to use the deprecated one for Python 2: bootstrap.pypa.io/2.7/get-pip.py)

  2. Installing it with the following command

    sudo /usr/bin/python get-pip.py

Note that without the sudo I got an error and was not able to install pip.

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