https://carl.duevel.online/tags/pyenv/ Recent content in Pyenv on Personal weblog Hugo en Fri, 25 Jun 2021 22:22:59 +0200 https://carl.duevel.online/blog/python_missing_system_deps/ Fri, 25 Jun 2021 22:22:59 +0200 https://carl.duevel.online/blog/python_missing_system_deps/ <p>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 href="https://www.google.com/search?q=ModuleNotFoundError%3A+No+module+named+&#39;underscore&#39;">a simple search has a whopping half a million hits on Google</a>).</p> <div id="outline-container-headline-1" class="outline-2"> <h2 id="headline-1"> The error </h2> <div id="outline-text-headline-1" class="outline-text-2"> <blockquote> <p>ModuleNotFoundError: No module named &#39;_lzma&#39;</p> </blockquote> <p>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 <a href="https://docs.python.org/3/library/lzma.html">that the lzma module</a> is part of the standard library. I could not find the module <em>_lzma</em> though. It turned out that the problem could be reproduced with a simple import statement:</p>