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native_non_unique_elements solution in Clear category for Non-unique Elements by Jon_Red
def checkio(data:list)->list:return[x for x in data if data.count(x)>1]
if __name__=='__main__':
# self-checks
assert list(checkio([1,2,3,1,3]))==[1,3,1,3],'1st example'
assert list(checkio([1,2,3,4,5]))==[],'2nd example'
assert list(checkio([5,5,5,5,5]))==[5,5,5,5,5],'3rd example'
assert list(checkio([10,9,10,10,9,8]))==[10,9,10,10,9],'4th example'
July 21, 2020
