Switching Python version installed by Homebrew
Question:
I have Python 3.8 and 3.9 installed via Homebrew:
~ brew list | grep python
[email protected]
[email protected]
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/[email protected]/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?
Answers:
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 $SHELL
Then find the name of the python version you want to switch to with this:
pyenv versions
And select it with this:
pyenv global <version-name>
In your case, it’s most likely named 3.9.0.
There is an Homebrew known issue related to side by side install of Python 3.8 / 3.9. To workaround, following commands should work for you:
brew unlink [email protected]
brew unlink [email protected]
brew link --force [email protected]
Re-opening your terminal or execute command rehash can be required to take account the change.
Updated MacOs Monterrey
For who are facing this problem add the pyenv path to your ~/.zshrc shell file.
export PATH="/Users/username/.pyenv/shims:${PATH}"
eval "$(pyenv init --path)"
Run in the terminal:
source ~/.zshrc
Check it out:
python3 --version
From the issue on GitHub.
I have Python 3.8 and 3.9 installed via Homebrew:
~ brew list | grep python
[email protected]
[email protected]
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/[email protected]/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?
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 $SHELL
Then find the name of the python version you want to switch to with this:
pyenv versions
And select it with this:
pyenv global <version-name>
In your case, it’s most likely named 3.9.0.
There is an Homebrew known issue related to side by side install of Python 3.8 / 3.9. To workaround, following commands should work for you:
brew unlink [email protected]
brew unlink [email protected]
brew link --force [email protected]
Re-opening your terminal or execute command rehash can be required to take account the change.
Updated MacOs Monterrey
For who are facing this problem add the pyenv path to your ~/.zshrc shell file.
export PATH="/Users/username/.pyenv/shims:${PATH}"
eval "$(pyenv init --path)"
Run in the terminal:
source ~/.zshrc
Check it out:
python3 --version
From the issue on GitHub.