Custom Lambda DataFrame

import pandas as pd

data = ['Vachitaya aapuuuuuuuuu','Sing in the rain' ,'Great power comes wih great responsibility']  
df = pd.DataFrame(data, columns = ['Sent'])
df

def sent_length(message):
    
    return (len(message))

df['len'] = df['Sent'].apply(sent_length)

df