Check for duplicates in a list
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some_list = ['a', 'b', 'c', 'b', 'd', 'm', 'n', 'n']
seen = set()
duplicates = set()
for char in some_list: #loop through chars
if char in seen: # if char is present in seen -> add to duplicates
duplicates.add(char)
seen.add(char) # otherwise if char is not present in seen -> add to seen
print(list(duplicates))
Python
INFO