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bpo-43926: Cleaner metadata with PEP 566 JSON support. (GH-25565)

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* bpo-43926: Cleaner metadata with PEP 566 JSON support.

* Add blurb

* Add versionchanged and versionadded declarations for changes to metadata.

* Use descriptor for PEP 566
This commit is contained in:
Jason R. Coombs 2021-05-02 17:03:40 -04:00 • committed by GitHub
parent 0ad1e0384c
commit 37e0c7850d
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12 changed files with 254 additions and 26 deletions
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19
Lib/importlib/metadata/_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