| 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 |
