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Q&A Reinstall old Python libraries after update

The pip freeze command may output individual dependencies with format zipp @ file:///Users/abcxyz/work/recipes/ci_py311/zipp_1677907997878/work Using this output will not work (unless you happen ...

posted 6mo ago by mudskipper‭

Answer
#1: Initial revision by user avatar mudskipper‭ · 2024-06-03T15:23:00Z (6 months ago)
The `pip freeze` command may output individual dependencies with format 

`zipp @ file:///Users/abcxyz/work/recipes/ci_py311/zipp_1677907997878/work`

Using this output will not work (unless you happen to be that user `abcxyz`). To generate a requirements file that does not refer to local, non-existing or no-longer existing cache directories, you can instead use 

`pip list --format=freeze > requirements.txt`

which will generate a requirements.txt file that only lists the specific versions, in the format `zipp==3.11.0`.

If you then run `pip install -r requirements.txt` for a newer version of Python, you may sometimes run into version conflicts. You can try to fix those by not pinning the dependency to a specific version (so simply by removing the `==3.11.0` in the example of `zipp==3.11.0`), but in some cases there may be no fix (if a dependency has no release yet for the newer Python and the older version somehow cannot be installed); in the worst case you'll have to temporarily remove the 3d party library.