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Docs: Add caution about ranges like py{39-314} #3652

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gaborbernat merged 1 commit into from
Dec 4, 2025
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Docs: Add caution about ranges like py{39-314} #3652

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7 changes: 7 additions & 0 deletions docs/config.rst
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Expand Up @@ -1688,6 +1688,13 @@ will create the following envs:

Negative ranges will also be expanded (``{3-1}`` -> ``{3,2,1}``), however, open ranges such as ``{1-}``, ``{-2}``, ``{a-}``, and ``{-b}`` will not be expanded.

.. caution::

Be conscious of the number of significant digits in your range endpoints.
A range like ``py{39-314}`` will not do what you may expect.
(It expands to 275 environment names,
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@ferdnyc ferdnyc Dec 5, 2025

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It's gonna bug me that that should've been 276. 🙄

``py39``, ``py40``, ``py41`` … ``py314``.)
Instead, use ``py3{9-14}``.


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