[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 opened https://github.com/python/cpython/pull/11591 to remove _valid_mask_octets, _is_valid_netmask and _is_hostmask from ipaddress, the patch proposed in issue27860 has a larger scope so it's probably better to remove those unused methods in this issue.

Does someone know how to set the skip news label on GitHub?

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