os.path: isabs takes AnyStr, not just unicode

[durin42]

Noticed this while running pytype on Mercurial.

[gvanrossum]

Don't they all?

[gvanrossum]

Also, when something is declared as taking unicode (in the PY2 stubs) then it actually also takes str/bytes. Can you show an example that failed with unicode but passed with AnyStr? I can't think of any.

[matthiaskramm]

@durin42 encountered this problem running pytype, not mypy. The example is simple:

os.path.isabs('foo.txt')

Also, when something is declared as taking unicode (in the PY2 stubs) then it actually also takes str/bytes.

We should document all these special rules.
(This one sounds like a mypy peculiarity that leaked into typeshed. Bound to happen, but let's start a list.)

[gvanrossum]

OK, let's close this (too specific) PR and continue the discussion at #270 (to document the rules) and also python/typing#208. See also python/mypy#1141.

[durin42]

Works for me. Thanks!

On Jun 5, 2016, at 10:49 PM, Guido van Rossum [email protected] wrote:

OK, let's close this (too specific) PR and continue the discussion at #270 #270 (to document the rules) and also python/typing#208 python/typing#208. See also python/mypy#1141 python/mypy#1141.

—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub #235 (comment), or mute the thread https://github.com/notifications/unsubscribe/AABPLXG_AtNtn07XN_oJpOEr2J8KUC3Eks5qI4qzgaJpZM4IrG5P.