Homebrew-core: Python 'pip' command not found

[mgg1776]

If Homebrew was updated on Aug 10-11th 2016 and brew update always says Already up-to-date. you need to run: cd $(brew --repo); git fetch; git reset --hard origin/master; brew update.

Please follow the general troubleshooting steps first:

• [x] Ran brew update and retried your prior step?
• [x] Ran brew doctor, fixed as many issues as possible and retried your prior step?
• [x] If you're seeing permission errors tried running sudo chown -R $(whoami) $(brew --prefix)?
  

  Bug reports:

Link to brew config and brew doctor output:
https://gist.github.com/anonymous/5f177f54f2c3e50982c587d3350d8384

I have Python 2.7 and Python 3.5 installed via Brew, which I understand should have installed 'pip' as well. However, running pip returns a "command not found error":

$ pip
-bash: pip: command not found

I do have the pip located in the Python 2.7 and 3.5 directories as shown below:

$ sudo find / -name pip
Password:

/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/bin/pip
/usr/local/Cellar/python/2.7.12/libexec/pip
/usr/local/Cellar/python/2.7.12/libexec/pip/build/lib/pip
/usr/local/Cellar/python/2.7.12/libexec/pip/pip
/usr/local/Cellar/python3/3.5.2_1/Frameworks/Python.framework/Versions/3.5/bin/pip
/usr/local/Cellar/python3/3.5.2_1/Frameworks/Python.framework/Versions/3.5/share/doc/python3.5/examples/Tools/msi/pip
/usr/local/Cellar/python3/3.5.2_1/libexec/pip
/usr/local/Cellar/python3/3.5.2_1/libexec/pip/build/lib/pip
/usr/local/Cellar/python3/3.5.2_1/libexec/pip/pip
/usr/local/lib/python2.7/site-packages/pip
/usr/local/lib/python3.5/site-packages/pip
/usr/local/lib/python3.5/site-packages/pip-8.1.2-py3.5.egg/pip

I can pip directly from those directories or via $ python -m pip or $ python3 -m pip.

Before adding pip to my PATH variable, I wanted to be sure there wasn't a problem with the way Python or pip was installed via Brew.

[MikeMcQuaid]

CC @tdsmith for pip thoughts as I'm not sure what's going on here.

[tdsmith]

What happens when you run brew postinstall python or brew postinstall python3?

[mgg1776]

That seems to have done the trick. What does the "postinstall" command do?

$ brew postinstall python
==> Using the sandbox
==> /usr/local/Cellar/python/2.7.12/bin/python -s setup.py --no-user-cfg install --force --verbose --single-version-externally-managed --record=installed.txt --install-scripts=/u
==> /usr/local/Cellar/python/2.7.12/bin/python -s setup.py --no-user-cfg install --force --verbose --single-version-externally-managed --record=installed.txt --install-scripts=/u
==> /usr/local/Cellar/python/2.7.12/bin/python -s setup.py --no-user-cfg install --force --verbose --single-version-externally-managed --record=installed.txt --install-scripts=/u

$ brew postinstall python3
==> Using the sandbox
==> /usr/local/Cellar/python3/3.5.2_1/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.5.2_1/bin --install-lib=/usr/l
==> /usr/local/Cellar/python3/3.5.2_1/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.5.2_1/bin --install-lib=/usr/l
==> /usr/local/Cellar/python3/3.5.2_1/bin/python3 -s setup.py --no-user-cfg install --force --verbose --install-scripts=/usr/local/Cellar/python3/3.5.2_1/bin --install-lib=/usr/l

$ pip -h

Usage:
pip [options]

Commands:
install Install packages.
download Download packages.
<...snip...>

$ pip3 -h

Usage:
pip [options]

Commands:
install Install packages.
download Download packages.
<...snip...>

[mgg1776]

That also fixed the problem I was having where if I installed a Python package using '$python -m pip install ', the new package name would not be a recognized command without specifying it's path.

Thanks for such a quick turnaround, guys.

[philip550c]

This did not work for me. It also appears that install is misspelled.

$ brew postinstall python
==> Postinstalling python
==> /usr/local/Cellar/python/2.7.14/bin/python2 -s setup.py --no-user-cfg instal
==> /usr/local/Cellar/python/2.7.14/bin/python2 -s setup.py --no-user-cfg instal
==> /usr/local/Cellar/python/2.7.14/bin/python2 -s setup.py --no-user-cfg instal

$ brew postinstall python3
==> Postinstalling python3
==> /usr/local/Cellar/python3/3.6.4/bin/python3 -s setup.py --no-user-cfg instal
==> /usr/local/Cellar/python3/3.6.4/bin/python3 -s setup.py --no-user-cfg instal
==> /usr/local/Cellar/python3/3.6.4/bin/python3 -s setup.py --no-user-cfg instal

[BenCoffeed]

@philip550c I ran into this issue as well. Here's what solved it for me:
sudo chown $(whoami):staff -R /usr/local/lib/Python2.7 && brew unlink python && brew link python

[marcqualie]

Along with the command above I also had to run the following to clean up an old run of sudo pip that had created files in /usr/local/bin.

sudo chown -R $(whoami):staff /usr/local/bin/{py*,*.py,*.pyc}