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python3.10
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metadata
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__init__.py
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__pycache__
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_adapters.py
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_collections.py
(743 B)
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_functools.py
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_itertools.py
(607 B)
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_meta.py
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_text.py
(2.15 KB)
Editing: _itertools.py
from itertools import filterfalse def unique_everseen(iterable, key=None): "List unique elements, preserving order. Remember all elements ever seen." # unique_everseen('AAAABBBCCDAABBB') --> A B C D # unique_everseen('ABBCcAD', str.lower) --> A B C D seen = set() seen_add = seen.add if key is None: for element in filterfalse(seen.__contains__, iterable): seen_add(element) yield element else: for element in iterable: k = key(element) if k not in seen: seen_add(k) yield element
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