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Uses built-in most_common method solution in Clear category for Sort Array by Element Frequency by rockwellshabani
from collections import Counter
def frequency_sort(items):
result = []
for k, v in Counter(items).most_common(): # utilizes built-in most common method, which returns
for i in range(v): # most common elements and their counts from the most common to the least.
result.append(k)
return result
if __name__ == '__main__':
print("Example:")
print(frequency_sort([4, 6, 2, 2, 6, 4, 4, 4]))
# These "asserts" are used for self-checking and not for an auto-testing
assert list(frequency_sort([4, 6, 2, 2, 6, 4, 4, 4])) == [4, 4, 4, 4, 6, 6, 2, 2]
assert list(frequency_sort(['bob', 'bob', 'carl', 'alex', 'bob'])) == ['bob', 'bob', 'bob', 'carl', 'alex']
assert list(frequency_sort([17, 99, 42])) == [17, 99, 42]
assert list(frequency_sort([])) == []
assert list(frequency_sort([1])) == [1]
print("Coding complete? Click 'Check' to earn cool rewards!")
Sept. 2, 2019