Improve protocols documentation #14577
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| :py:func:`isinstance` with protocols is not completely safe at runtime. | ||
| For example, signatures of methods are not checked. The runtime | ||
| implementation only checks that all protocol members are defined. | ||
| implementation only checks that all protocol members exist, |
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It also doesn't check attributes at all, only methods, if I recall correctly. That might be worth mentioning.
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isinstance() checks both, but issubclass() checks only methods.
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
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Linking #13681