Count Unique Values by Group in pandas DataFrame

How to count the distinct values by group in the column of a pandas DataFrame in the Python programming language. More details: https://statisticsglobe.com/count-unique-values-group-column-pandas-dataframe-python
Python code of this video:

import pandas as pd # Import pandas

data = pd.DataFrame({'values':[1, 2, 3, 1, 1, 1, 1, 2, 2], # Create example DataFrame
'groups':['a', 'a', 'a', 'a', 'b', 'b', 'c', 'c', 'c']})
print(data) # Print example DataFrame

count_unique = data.groupby('groups')['values'].nunique() # Apply unique function
print(count_unique) # Print count of unique values
# groups
# a 3
# b 1
# c 2
# Name: values, dtype: int64

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