· poetry python til

Python/Poetry: Library not loaded: no such file, not in dyld cache

As I mentioned in a previous blog post, I’ve been using Python’s Poetry library, but today it stopped working! In this blog post, I’ll explain what happened and how I got it working again.

It started off innocent enough, with me trying to create a new project:

poetry init

But instead of seeing the usual interactive wizard, I got the following error:

dyld[20269]: Library not loaded: /opt/homebrew/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/Python
  Referenced from: <1B2377F9-2187-39A9-AA98-20E438024DE2> /Users/markhneedham/Library/Application Support/pypoetry/venv/bin/python
  Reason: tried: '/opt/homebrew/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/Python' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/Python' (no such file), '/opt/homebrew/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/Python' (no such file), '/Library/Frameworks/Python.framework/Versions/3.11/Python' (no such file), '/System/Library/Frameworks/Python.framework/Versions/3.11/Python' (no such file, not in dyld cache)

It seems to be looking for Python version 3.11.3 in a variety of different places. I installed Python using brew, so let’s check what’s in that directory:

ls -lh /opt/homebrew/Cellar/python@3.11
total 0
drwxr-xr-x@ 13 markhneedham  admin   416B 30 Jun 12:50 3.11.4_1

There isn’t a Python 3.11.3 and I don’t recall moving it, but it is possible that a brew update might have updated the Python version. It also mentions that the Python version was referenced from /Users/markhneedham/Library/Application Support/pypoetry/venv/bin/python, which I thought might be a symbolic link that I could update. Unfortunately, it’s a binary file so we can’t do that.

file "/Users/markhneedham/Library/Application Support/pypoetry/venv/bin/python"
/Users/markhneedham/Library/Application Support/pypoetry/venv/bin/python: Mach-O 64-bit executable arm64

Luckily StackOverflow came to the rescue with some classic turn it off and on again advice. So let’s first uninstall Poetry:

curl -sSL https://install.python-poetry.org | python - --uninstall

And then reinstall it:

curl -sSL https://install.python-poetry.org | python -

It works for me after doing this and Poetry’s python executable now uses brew’s version of Python:

"/Users/markhneedham/Library/Application Support/pypoetry/venv/bin/python" --version
Python 3.11.4
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