如何让命令行中的 python3 指向我用 homebrew 安装的版本？

Question

This is what I see in terminal:

My-MacBook-Pro:~ username$ which python3
/usr/bin/python3
My-MacBook-Pro:~ username$ python3
-bash: /usr/local/bin/python3: No such file or directory

There is no python3 binary at /usr/local/bin/ .

There is a file called python3 at /usr/bin/ however.

Answer 1

You may need to put it in the front of your path. If you are using bash, do this:

echo 'export PATH="/usr/local/opt/python/libexec/bin:$PATH"' >> ~/.bash_profile

Then either source ~/.bash_profile or open a new terminal. Then try which python and it should show you the version in this directory. Or type in python --version and it will report "Python 3.7.7".

Answer 2

Which version did you install?

Run brew info [python-package] and you should see something like this (for example I installed python@3.8 , so I ran brew info python@3.8 )

If you need to have python@3.8 first in your PATH run:
  echo 'export PATH="/usr/local/opt/python@3.8/bin:$PATH"' >> ~/.zshrc

Just run the line and restart terminal, it should be working.

Answer 3

I closed terminal and then reopened it and it fixed the problem. Now typing python3 opens the python interpreter.