Multiple python installations
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One common challenge with multiple python installations is installing packages to one installation while running another.

.. warning::
    Best bet might be to avoid multiple python installations if possible.

However, if you insist ...

Installing packages to a particular python installation
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The typical pip installation process::

    $ pip install seaborn

Is a bit vague in that it doesn't specify exactly which python installation we're using.  An equivalent, but more explicit, version of the above statement is::

    $ /usr/bin/python3 -m pip install seaborn

where `/usr/bin/python3` is the path to some particular python installation.  Your own path will likely look different from this.

So how do I find where my own installation is?
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To find it, type the following at any python prompt::

    >>> import sys
    >>> print(sys.executable)

And it'll print out the executable file of the currently running installation.

.. note::
    Do not type the `>>> ` or `$ ` signs above when giving the commands.  `>>> ` indicates the command should be run in a python prompt like jupyter or spyder while `$ ` indicates a terminal / command prompt.