Removing lower case letter in column of Pandas dataframe

You can update the name column by making use of .str.replace(..) [pandas-doc]:

df['Name'] = df['Name'].str.replace('[a-z]', '')

For the given sample data, this gives us:

>>> df['Name'].str.replace('[a-z]', '')
0      TOM
1     NICK
2    KRISH
3     JACK
Name: Name, dtype: object

You can try this too if you don't like RegEx:

df['Name'].apply(lambda x: ''.join([letter for letter in x if letter.isupper()]))

For all rows in the Name column, concatenate all letters that are uppercase.

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