function to take count of unique values in a column in python code example

Example 1: count unique pandas

df['column'].nunique()

Example 2: count unique values in python

words = ['a', 'b', 'c', 'a']
unique_words = set(words)             # == set(['a', 'b', 'c'])
unique_word_count = len(unique_words) # == 3