Dataframe Apply method to return multiple elements (series)

Question

import pandas as pd

Let\'s say I have a dataframe like so:

df = pd.DataFrame({\"a\":range(4),\"b\":range(1,5)})
         


        

Answer 1

the following solution to this frustratingly frustrating question works for me. I found the original suggestion in another StackOverflow post a while ago. The trick is to wrap up the return values into a Series like this:

def divideAndMultiply(x,y):
    return pd.Series([x/y, x*y])

Then this works as you wanted:

df[['e','f']] = df.apply( lambda x: divideAndMultiply(x["a"],2) , axis =1)