Why pip3 install in python2 sitepackages

Question

First I use

Python 3.6.5
Python 2.7.14
and mac.

In my case, I just download module like numpy(for example, and other\'s same)

Answer 1

Find the absolute path of the python3 interpreter with a command like this:

$ which python3
/Library/Frameworks/Python.framework/Versions/3.6/bin/python

Your path may be something different, of course. Copy that line to your clipboard.

Edit the pip3 script, which was installed using incorrect interpreter. Something like this:

vi $(which pip3)

You might need to use sudo here, but try it first without. The first line will be something like:

#!/Library/Frameworks/Python.framework/Versions/2.7/bin/python

Change it to the path found in the previous step, e.g.

#!/Library/Frameworks/Python.framework/Versions/3.6/bin/python

Save the pip3 file and exit. This should be sufficient to associate pip3 with the correct environment. Check and verify the result with pip3 --version. Now pip3 install numpy should work as expected.