Web Reference: May 18, 2022 · I am trying to install a library from the source that makes use of Poetry, but I get this error error: Multiple top-level packages discovered in a flat-layout: ['tulips', 'fixtures']. Apr 5, 2025 · Some of these top level directories may be actual Python packages, others might be unrelated directories like tests or assets. Without clear directions, tools like setuptools can get confused and refuse to guess what it should install. Apr 30, 2023 · Now I have a few other top-level folders, so I get the titled error message when running python -m build. The guidance I find online suggests resolving this by adding a tools.setuptools.packages entry to my pyproject.toml, and indeed this works.
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