feat: Support always fetching a standalone python interpreter#1663
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feat: Support always fetching a standalone python interpreter#1663
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13steinj
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There exist environments where users need known "good" python
interpreters to run their commands from. Notably, linux distros _can_
package non-standard alterations to their Python interpreters, or not
have certain "optional" features.
This commit adds `--fetch-python={always, missing, never}` and the
associated environment variable `PIPX_FETCH_PYTHON`.
`--fetch-missing-python` has been deprecated and aliased to
`--fetch-python=missing`. The corresponding change has been made to
`PIPX_FETCH_MISSING_PYTHON`.
StrEnum only available in 3.11 :(
13steinj
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gaborbernat
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gaborbernat
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Mar 18, 2026
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| # XXX: Python 3.11 StrEnum + enum.auto() | ||
| class FetchPythonOptions(str, enum.Enum): |
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older python versions don't support it, at the time pipx still supported those versions
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changelog.d/(if the patch affects the end users)Summary of changes
There exist environments where users need known "good" python interpreters to run their commands from. Notably, linux distros can package non-standard alterations to their Python interpreters, or not have certain "optional" features.
This commit adds
--fetch-python={always, missing, never}and the associated environment variablePIPX_FETCH_PYTHON.--fetch-missing-pythonhas been deprecated and aliased to--fetch-python=missing. The corresponding change has been made toPIPX_FETCH_MISSING_PYTHON.N.b. happy to bikeshed on the name.
Test plan
Tested by running (on a machine with and without python3.{9,10,11}, with and without the environment variable
N.b. ran those commands with #1662 cherry picked.
I am happy to add automatic tests as well, I just don't know exactly what would be preferred / which cases you'd like tested. Happy to add any tests requested.