Managing Python on macOS Big Sur

Managing Python on macOS Big Sur

Russ McKendrick Russ McKendrick | | 3 min read | Suggest Changes

When Apple releases a new version of macOS it always takes a few months for everything to catchup, following my last blog post where I mentioned that I was having problems installing Python on macOS Big Surwhich meant that my preferred method of installing and managing Python using pyenv, which is documented in this blog post, didn’t work out of the box — and the workarounds suggested workarounds on GitHub made my shell really slow.

Luckily, I noticed that there was an update to both Python andpyenv when I ran brew update today so decided to give pyenv another try, and it worked as expected.

First I manually installed some prerequisites suggested on various GitHub issues, just to be on the safe side:

Install some prerequisites
``` terminfo
brew install zlib sqlite bzip2 libiconv libzip
Next up you can either install or upgrade to the latest version of `pyenv`, which during writing is `1.2.22`:
```bash frame="terminal" title="Install pyenv"
``` terminfo
brew install pyenv
If like me, you need to upgrade, then you can run:
```bash frame="terminal" title="Upgrade pyenv"
``` terminfo
brew upgrade pyenv
Once the latest version `pyenv` has been installed, run the following commands to install the latest stable version of Python, which is currently 3.9.1:
```bash frame="terminal" title="Install Python 3.9.1 using pyenv"
``` terminfo
pyenv install 3.9.1
pyenv global 3.9.1
pyenv version
Once installed, run the following command to make sure that the `pyenv` managed version of Python is picked up:
<InfoCallout title="Info">
**Update: 11/06/2021;** the command below has been updated to include a change to how the "pyenv init" command works.
</InfoCallout>
```bash frame="terminal" title="Make sure the pyenv version is used"
``` terminfo
echo -e $'if command -v pyenv 1>/dev/null 2>&1; then\\n export PYENV_ROOT="$HOME/.pyenv"\\n export PATH="$PYENV_ROOT/bin:$PATH"\\n eval "$(pyenv init --path)"\\n eval "$(pyenv init -)"\\nfi' >> ~/.zshrc
Open a new shell and run:
```bash frame="terminal" title="Check the python version"
``` terminfo
python --version
which python
This should return something like the following:
```bash frame="terminal" title="Output of the commands"
$ python --version
Python 3.9.1
$ which python
/Users/russ.mckendrick/.pyenv/shims/python

The final step is to make sure that pip is up-to-date, to do this run:

Update pip
``` terminfo
pip install --upgrade pip
This fixed a few issues I had when I ran:
```bash frame="terminal" title="Install Ansible"
``` terminfo
pip install --user ansible
Which meant that I didn't need to use [my custom container anymore](/2020/12/28/ansible-azure-and-macos-big-sur/).

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