Avoid DeprecationWarning about ABC in Python 3.x #1354
Merged
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Python 3.x complains about the
collections.Mapping
vscollections.abc.Mapping
. There is already a shim for it inmarshmallow.compat
, so switched to using that.Though I poked at the
collections.Mapping
in 3.8 and it said "...is deprecated since Python 3.3,and in 3.9 it will stop working", so it's maybe not as critical, but it removes nagging. See python/cpython#13409