Current File : //lib/python3/dist-packages/setuptools/_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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