Homebrew Python Is Not For You. If you’ve been running into frustrations with your Homebrew Python environments breaking over the past few months (the dreaded “Reason: image not found” error) Justin Mayer has a good explanation. Python in a Homebrew is designed to work as a dependency for their other packages, and recent policy changes that they made to support smoother upgrades have had catastrophic problems effects on those of us who try to use it for development environments.