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1import sys
3from . import py311
5# Distribution.origin was added in Python 3.13, so a provider built on
6# importlib.metadata cannot supply it on every supported Python and must
7# not be faulted for its absence.
8exempt = frozenset({'origin'}) if sys.version_info < (3, 13) else frozenset()
11def required(protocol):
12 """
13 The members a protocol expects of a provider on this Python.
14 """
15 return set(py311.protocol_attrs(protocol)) - exempt
18def tolerant_conforms(instance, protocol): # pragma: no cover
19 """
20 Determine conformance, overlooking the exempt members.
22 Consults the type rather than the instance, which also keeps
23 isinstance() from evaluating property members on Python 3.11
24 (https://github.com/python/cpython/issues/102433).
25 """
26 return all(hasattr(type(instance), attr) for attr in required(protocol))
29conforms = tolerant_conforms if sys.version_info < (3, 13) else isinstance