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unrecognized-platform-check (PYI007)#

Derived from the flake8-pyi linter.

What it does#

Check for unrecognized sys.platform checks. Platform checks should be simple string comparisons.

Note: this rule is only enabled in .pyi stub files.

Why is this bad?#

Some sys.platform checks are too complex for type checkers to understand, and thus result in false positives. sys.platform checks should be simple string comparisons, like sys.platform == "linux".

Example#

if sys.platform.startswith("linux"):
    # Linux specific definitions
    ...
else:
    # Posix specific definitions
    ...

Instead, use a simple string comparison, such as == or !=: 

if sys.platform == "linux":
    # Linux specific definitions
    ...
else:
    # Posix specific definitions
    ...

References#