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--python-version broken on mypy 0.590 #4923

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amyreese opened this issue Apr 17, 2018 · 2 comments
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--python-version broken on mypy 0.590 #4923

amyreese opened this issue Apr 17, 2018 · 2 comments

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@amyreese
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With mypy 0.580 and python 3.6, I can run:

$ mypy --python-version 3.5 <module>

This worked fine, and would catch things like use of f-strings that aren't back-compatible.

With mypy 0.590 however, this breaks with the following error:

mypy: error: Error: failed to find a Python executable matching version (3, 5), perhaps try --python-executable, or --no-site-packages?

I am running this against latest master from https://github.com/jreese/aiosqlite

Full repro: https://gist.github.com/jreese/c20759267e08aa45b7ce4a29747f5337
@JelleZijlstra
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You need to add the --no-site-packages flag to run mypy for a specific version without an accessible executable.

@emmatyping emmatyping mentioned this issue Apr 17, 2018
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@amyreese
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Yep, that did it. I saw that suggestion in the error message (on travis) and tried it on my local machine, but it claimed that didn't exist. Turns out, I still had an old version of mypy installed locally when testing that fix, and didn't retest that fix while generating the repro.

Sorry for the noise. Cheers!

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@amyreese @JelleZijlstra