-- creating and initializing a list
values= [['Rohan',455],['Elvish',250],['Deepak',495],
['Soni',400],['Radhika',350],['Vansh',450]]
-- creating a pandas dataframe
df = pd.DataFrame(values,columns=['Name','Total_Marks'])
-- Applying lambda function to find
-- percentage of 'Total_Marks' column
-- using df.assign()
df = df.assign(Percentage = lambda x: (x['Total_Marks'] /500 * 100))