Sha256: e53523fc03c91eade9be39f4e219cfda860179b3f6368ec798d1ff864386c0b4
Contents?: true
Size: 607 Bytes
Versions: 3
Compression:
Stored size: 607 Bytes
Contents
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
Version data entries
3 entries across 3 versions & 1 rubygems