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| 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 | |