pandas group count unique code example
Example 1: count unique pandas
df['column'].nunique()
Example 2: count unique pandas
df.nunique()
Example 3: pandas groupby count unique rows
ID, domain
123, 'vk.com'
123, 'vk.com'
123, 'twitter.com'
456, 'vk.com'
456, 'facebook.com'
456, 'vk.com'
456, 'google.com'
789, 'twitter.com'
789, 'vk.com'