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OrderedDict solution in Clear category for Sort Array by Element Frequency by martin.pilka
def frequency_sort(items):
from collections import Counter, OrderedDict
counts = Counter(items)
r = []
for i in sorted(OrderedDict.fromkeys(items).keys(), key=counts.get, reverse=True):
r.extend([i]*counts[i])
return r
Feb. 1, 2019
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