how to find unique values count in pandas code example

Example 1: count unique pandas

df['column'].nunique()

Example 2: pandas count the number of unique values in a column

df['hID'].nunique()
5

Example 3: 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