python count number of unique elements in a list
# Basic syntax: len(set(my_list)) # By definition, sets only contain unique elements, so when the list # is converted to a set all duplicates are removed. # Example usage: my_list = ['so', 'so', 'so', 'many', 'duplicated', 'words'] len(set(my_list)) --> 4 # Note, list(set(my_list)) is a useful way to return a list containing # only the unique elements in my_list