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Python Setting Up a Local Python Environment Installing Python and Python Libraries Locally Installing Python 3 on Mac OS X

Posted by underfish
underfish
3,226 Points

What path do you get when you run `which python3`?

$ which python3
/Library/Frameworks/Python.framework/Versions/3.5/bin/python3
$ which python
/usr/local/bin/python

Is this correct? I feel like both Python 2 and 3 should be in /usr/local/bin.

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

Yes and no. which shows where along your PATH has the first occurrence of python3.

Depending on how Python 3 was installed or if a virtual environment is active, the PATH can be altered to put a different directory earlier in the PATH. This affects what which returns.

Do you see python3 in the /use/local/bin directory?

How was python3 installed?

underfish
underfish
3,226 Points

Python3 showed up in /Library/Frameworks/Python.framework/Versions/3.5/bin so I switched up my PATH to have /usr/local/bin appear first, now it appears there.

I pip installed flake8 and it wasn't executable so I added /Library/Frameworks/Python.framework/Versions/3.5/bin/flake8 to the PATH. Now it is executable. Is this the correct usage for global packages (I know virtualenv's are better for local packages) or should I expect flake8 to show up somewhere else?

TBH, I forget how I installed Python 3. Either by Homebrew or the Python.org download package or both... There is so much dev junk on this Mac from working in various environments.