dropna based on one column pandas code example

Example 1: dropping nan in pandas dataframe

df.dropna(subset=['name', 'born'])

Example 2: drop na pandas

>>> df.dropna(subset=['name', 'born'])
       name        toy       born
1    Batman  Batmobile 1940-04-25

Example 3: dropna pandas

>>> df.dropna(axis='columns')
       name
0    Alfred
1    Batman
2  Catwoman