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F6 `platform.system` is not treated the same way as `sys.platform` · Issue #19039 · python/mypy · GitHub
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platform.system is not treated the same way as sys.platform #19039

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dzherb opened this issue May 5, 2025 · 1 comment
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platform.system is not treated the same way as sys.platform #19039

dzherb opened this issue May 5, 2025 · 1 comment
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@dzherb
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dzherb commented May 5, 2025 •
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Bug Report

It seems that conditions using platform.system() are not treated the same way as those using sys.platform. I'm not sure if this is a bug or a missing feature.

To Reproduce

import platform
import sys


def works() -> None:
    if sys.platform == "win32":
        import some_win_dependency
        some_win_dependency.do_stuff()
        return
    ...
    return

def doesnt_work() -> None:
    if platform.system() == "Windows":
        import some_win_dependency  # got [import-not-found]
        some_win_dependency.do_stuff()
        return
    ...
    return

Your Environment

  • Mypy version used: 1.15.0
  • Mypy command-line flags:
  • Mypy configuration options from mypy.ini (and other config files):
  • Python version used: 3.13
@dzherb dzherb added the bug mypy got something wrong label May 5, 2025
@JelleZijlstra JelleZijlstra added feature and removed bug mypy got something wrong labels May 5, 2025
@erictraut
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erictraut commented May 5, 2025 •
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The typing spec mandates that type checkers understand an expression of the form sys.platform == "win32". It doesn't mention the form platform.system() == "Windows". It also cautions against using more complex forms (such as call expressions) and expecting them to work with static type checkers. See this section of the typing spec for details.

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@JelleZijlstra @erictraut @dzherb








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