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EDIT :: _itertools.py

from setuptools.extern.more_itertools import consume # noqa: F401 # copied from jaraco.itertools 6.1 def ensure_unique(iterable, key=lambda x: x): """ Wrap an iterable to raise a ValueError if non-unique values are encountered. >>> list(ensure_unique('abc')) ['a', 'b', 'c'] >>> consume(ensure_unique('abca')) Traceback (most recent call last): ... ValueError: Duplicate element 'a' encountered. """ seen = set() seen_add = seen.add for element in iterable: k = key(element) if k in seen: raise ValueError(f"Duplicate element {element!r} encountered.") seen_add(k) yield element

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