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bpo-43428: Sync with importlib_metadata 3.7. (GH-24782)

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* bpo-43428: Sync with importlib_metadata 3.7.2 (67234b6)

* Add blurb

* Reformat blurb to create separate paragraphs for each change included.
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Jason R. Coombs 2021-03-13 11:31:45 -05:00 • committed by GitHub
parent 2256a2876b
commit f917efccf8
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8 changed files with 343 additions and 43 deletions
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19
Lib/importlib/_itertools.py Normal file
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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