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Double sorted: first appearance, then popularity solution in Clear category for Sort Array by Element Frequency by grischenko.n
def frequency_sort(items):
popularity = dict(map(lambda x: (x, items.count(x)), items))
# Sort by first appearance in list
r = sorted(items, key=lambda x: items.index(x))
# Now resort by popularity, preserving first appearance
return sorted(r, key=lambda x: popularity[x], reverse=True)
March 6, 2020
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