pip install Works, Production Breaks: Dependency Hell Fix

The Package That Wasn't There Your CI pipeline is green. pip install ran without errors. The Docker build succeeded. You deploy to production, and suddenly: ModuleNotFoundError: No module named 'cryptography' But cryptography is right there in requirements.txt . You can see it in the build logs. It installed successfully. What's happening? This isn't a random failure. It's the gap between "pip said yes" and "the runtime can actually import it." I've seen this kill three production deployments in one week, each for a different reason. Photo by Daniil Komov on Pexels Why pip install Success Means Nothing When pip install cryptography exits with code 0, it means one thing: pip successfully placed files on disk. It does NOT mean: The package can be imported Its binary dependencies are present The Python version can load it Another installed package won't break it at runtime Continue reading the full article on TildAlice