[issue35734] ipaddress's _BaseV4._is_valid_netmask fails to detect invalid netmask like 255.254.128.0

[Rémi Lapeyre]

Rémi Lapeyre <remi.lapeyre at henki.fr> added the comment:

I couldn't find any use of _is_valid_netmask() in the code, why should this netmask be invalid?

As far as I can tell this should be a valid one, is there a reason to refuse it?

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nosy: +remi.lapeyre

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35734>
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