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bpo-44771: Apply changes from importlib_resources 5.2.1 (GH-27436)

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* bpo-44771: Apply changes from importlib_resources@3b24bd6307

* Add blurb

* Exclude namespacedata01 from eol conversion.
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Jason R. Coombs 2021-07-29 21:05:05 -04:00 • committed by GitHub
parent 851cca8c22
commit aaa83cdfab
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19 changed files with 716 additions and 375 deletions
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19
Lib/importlib/_itertools.py Normal file
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@ -0,0 +1,19 @@
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