No module named 'yaml' on MacOS

[hhemied]

I'm getting the following errors when I run any related yamllint command.

➜ yamllint --help
Traceback (most recent call last):
  File "/usr/local/bin/yamllint", line 5, in <module>
    from yamllint.cli import run
  File "/usr/local/lib/python3.9/site-packages/yamllint/cli.py", line 27, in <module>
    from yamllint import linter
  File "/usr/local/lib/python3.9/site-packages/yamllint/linter.py", line 19, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'

I used brew to install yamllint and ensured that pyyaml and libyaml are also installed.

[andrewimeson]

1. Is it a fresh installation from Homebrew and it broke immediately, or did it work for a while and upgrades may have broken it?
2. How did you install pyyaml and libyaml? Is it possible you installed them into a different Python environment?

Troubleshooting commands:

brew doctor
which python3
python3 -m pip freeze | grep -i -e yamllint -e pyyaml

To force a reinstall brew uninstall yamllint && brew install yamllint

[hhemied]

Thank @andrewimeson for the hint. brew doctor showed unlinked formula Now fixed and working again.