I got to work on a Python code-base in the last days and have been struggling to get to a stable development environment. I learned some lessons along the way. Here is one of them, as it seems to be rather common and causes headaches for many people (a simple search has a whopping half a million hits on Google).
The error
ModuleNotFoundError: No module named '_lzma'
I found this error at the bottom of a very long stack trace after running a unit test. That was suprising as the tests had worked fine before. I stashed all current changes, but the error persisted. I recognized that the lzma module is part of the standard library. I could not find the module _lzma though. It turned out that the problem could be reproduced with a simple import statement:
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