🐛 fix(config): restore skip_missing_interpreters default to False - #3966
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Restore the tox 3 behavior where missing interpreters fail the run by default. The tox 4 rewrite silently changed this to True, which can hide real configuration problems.
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fghaas
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
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I quite liked the changed default. :) xkcd1172 |
mrtmm
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
This was referenced Jul 1, 2026
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
This was referenced Jul 3, 2026
mrtmm
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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Jul 3, 2026
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
mrtmm
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
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tox-gh does not recognize 3.x as a valid version and falls back to letting tox choose the environments, therefore all envs are executed even if 3.11 interpreter is not installed. This was always broken, but hidden as tox's option skip_missing_interpreters default to true, so 3.11 was executed but skipped. With tox-dev/tox#3966 and tox-4.96.0 the default changed to false, making tox report an error that 3.11 interpreter could not be found on the 3.x matrix.
justin-stephenson
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tox-gh does not recognize 3.x as a valid version and falls back to letting tox choose the environments, therefore all envs are executed even if 3.11 interpreter is not installed. This was always broken, but hidden as tox's option skip_missing_interpreters default to true, so 3.11 was executed but skipped. With tox-dev/tox#3966 and tox-4.96.0 the default changed to false, making tox report an error that 3.11 interpreter could not be found on the 3.x matrix.
This was referenced Jul 24, 2026
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The tox 4 rewrite unintentionally changed the default of
skip_missing_interpretersfromFalsetoTrue. This means tox reports success even when configured environments can't find their Python interpreter — a typo inenv_listor a genuinely missing interpreter goes unnoticed.This restores the tox 3 behavior: missing interpreters fail the run by default. Users who rely on the current behavior can set
skip_missing_interpreters = truein their tox config or pass--skip-missing-interpreterson the command line.