I have Python 3.8 and 3.9 installed via Homebrew:
~ brew list | grep python
python@3.8
python@3.9
I want to use Python 3.9 as my default one with python3
command. I tried the following:
~ brew switch python 3.9
Error: python does not have a version "3.9" in the Cellar.
python's installed versions: 3.8.6
I tried to uninstall Python and reinstall it, but it's used by other packages:
~ brew uninstall python
Error: Refusing to uninstall /usr/local/Cellar/python@3.8/3.8.6
because it is required by glib and php, which are currently installed.
You can override this and force removal with:
brew uninstall --ignore-dependencies python
How can I use Python 3.9?
There is an Homebrew known issue related to side by side install of Python 3.8 / 3.9 . To workaround, following commands should work for you:
brew unlink python@3.9
brew unlink python@3.8
brew link --force python@3.9
Re-opening your terminal or execute command rehash
can be required to take account the change.
Use pyenv
. It's a software that lets you switch between any and all Python versions installed on your system. To install pyenv
, use the following code in the command-line:
curl https://pyenv.run | bash
exec $SHELL
Then find the name of the python version you want to switch to with this:
pyenv versions
And select it with this:
pyenv global <version-name>
In your case, it's most likely named 3.9.0
.
Updated MacOs Monterrey
For who are facing this problem add the pyenv path to your ~/.zshrc
shell file.
export PATH="/Users/username/.pyenv/shims:${PATH}
eval "$(pyenv init --path)
Run in the terminal:
source ~/.zshrc
Check it out:
python3 --version
Font from the issue on GitHub .
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