When you run
brew upgrade or
brew upgrade <package>, all the packages are upgraded or packages linked to that particular package you want to upgrade gets updated. For Python, if the version upgrade is minor, then it should be fine. But major updates break a lot of development setup like, if you are used to develop using virtual environment, then you might have re-install every package. Real problem comes in when packages do not get installed in newer environment, then you need to downgrade your Python to make those packages work. Don’t worry though, here are steps on how you can fix this problem and prevent it from happening in future.
Bonus content: How to create and maintain multiple Python 3.XX versions in your system 💥.
If you have everything working, then you should consider keeping that formula being upgraded in future. As per documentation, you can
pin the formula like this:
brew pin python
Then next time you consider upgrading python, unpin the formula and run upgrade:
brew unpin python brew upgrade
If you want to install specific version of Python, then install it using:
brew install email@example.com
But lets say you do not want to disrupt your current version of Python, rather you would have a different Python version installed or keep multiple Python versions, then you can tap a new formula like this:
brew install firstname.lastname@example.org
Then if you want to change back to other Python versions, then link like this:
brew link --force email@example.com
If you are already nuked, then why not consider changing to
pyenv. Reason is that, you can easily switch between Python environments and create virtual environments without any issues.
Please follow these steps to install Python:
1. To install PyEnv, you can use brew:
brew update brew install pyenv
2. Then clone the repository to to get the latest version of pyenv
git clone https://github.com/pyenv/pyenv.git ~/.pyenv
3. Now, define your environment variables
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
Or if you are using zsh shell, then:
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.zshrc echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.zshrc
Or fish shell:
set -Ux PYENV_ROOT $HOME/.pyenv set -Ux fish_user_paths $PYENV_ROOT/bin $fish_user_paths
4. Restart your shell so the path changes take effect
5. Verify the installation and check the available python versions
pyenv install --list
6. Install the required python version
brew install zlib readline openssl xz pyenv install 3.8.6
7. Set it as your global version after installation
pyenv global 3.8.6
8. Verify your current python version the system is using
9. [Optional] Use
pyenv-virtualenv plugin to control virtual environments.
You can easily switch Python versions in your system like this:
pyenv install 3.7.0 pyenv versions pyenv global 3.7.0 python --version
If you do not want to take hassle of pip, then consider anaconda based environment. You can install Python versions using:
conda install python=$pythonversion$
If you want to maintain multiple environments, then try like this:
conda create --name py36 python=3.6 conda activate py36
brew upgrade can nuke your Python development setup, but it should be okay as long as you can solve it in minimal amount of time. Also as a bonus, now you can maintain multiple Python 3.XX versions in your machine 😄.
Thank you for reading. If you have any questions or concerns, please share via comment section below.
Last updated: Jan 14, 2021