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URL: http://github.com/python/importlib_metadata/issues/526

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`packages_distributions` relies on setuptools implementation detail · Issue #526 · python/importlib_metadata · GitHub
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packages_distributions relies on setuptools implementation detail #526

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packages_distributions relies on setuptools implementation detail#526
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@konstin

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@konstin
konstin
opened on Oct 24, 2025

This is a follow-up to #402.

packages_distributions reads top_level.txt to determine the names. This file isn't part of any PEP and to my knowledge only implemented by setuptools, as a historical artifact from eggs. This leads users to believe that build backends not supporting this function have a bug (astral-sh/uv#16423).

Would it be possible to update the documentation to accurately reflect that this is not a problem with some PEP 660 build backends not supplying top-level names, but that this function is generally not expected to work with editable installs at all, with the historical exception of setuptools?

(This may change with PEP 794)

importlib_metadata/importlib_metadata/__init__.py

Lines 1133 to 1134 in 95ecf2a

def _top_level_declared(dist):
return (dist.read_text('top_level.txt') or '').split()

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