i want to get only first record of each user in pandas code example

Example 1: i want to get only first record of each user in pandas

>>> df.groupby('id').first()
     value
id        
1    first
2    first
3    first
4   second
5    first
6    first
7   fourth

Example 2: select first row of every group pandas

df.drop_duplicates(subset='A')