I am trying to install dependencies using pip3
command
current scenario:
Dev$ which python /Users/Dev/anaconda/bin/python Dev$ which python3 /usr/local/bin/python3 Dev$ pip --version pip 10.0.1 from /usr/local/lib/python2.7/site-packages/pip (python 2.7) Dev$ pip3 --version -bash: /usr/local/bin/pip3: /usr/local/opt/python3/bin/python3.6: bad interpreter: No such file or directory
I have no idea why my pip3
command is not working.
I have tried things like this:
brew link --overwrite python
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Answer
You’ve got a whole slew of different Python installations, plus at least one former Python installation that you deleted.
Situations like this are exactly why running pip
or pip3
directly is no longer recommended, in favor of:
python3 -m pip install whatever
This guarantees that you’re absolutely positively running the pip
that goes with whatever python3
means, while pip3
just means you’re running the pip
that goes with some Python 3.x, which may be any of the various ones you’ve installed.
Or, even better, use virtual environments, so you can rely on the fact that python
and pip
are the commands from the currently-active environment, and not even worry about what they mean system-wide.
But, if you want to know how you got into this mess and how to fix it:
Your python3
command is probably from a Homebrew Python (you can check; ls -l /usr/local/bin/python3
and see if it’s a symlink to something in /usr/local/Cellar/python
).
Your pip3
command is from a Python 3 that doesn’t exist. Most likely, you installed another Python 3, which overwrote the pip3
from the Homebrew Python 3, and then uninstalled it, leaving a broken pip
behind.
The simplest thing to do is to just rm /usr/local/bin/pip3
. Then, assuming you want your Homebrew Python to be your default for python3
and pip3
, redo the brew link python
command. If it shows you any warnings or errors, you still have other things to fix. If not, /usr/local/bin/pip3
should now be the Homebrew 3.6 pip
, and which pip3
should pick out /usr/local/bin/pip3
, and everything is good until the next time you install another Python 3 and overwrite a bunch of stuff.
A better fix would be to pick one way of installing Python—whether Anaconda, Homebrew, python.org installers, or whatever—and use that consistently. Uninstall everything, reinstall the one you actually want, and never touch the others again. (Unfortunately, you will still be stuck with Apple’s system Python 2.7, but if you’re only using 3.x, that won’t matter.)