I need to apply a function and have the returned list’s values inserted into columns in the (new) dataframe. That is, if I have this:

import pandas as pd
def fu(myArg):
    return {"one":myArg,"two":20}
li = [10,20]
df = pd.DataFrame(li,columns=["myArg"])

i would like to apply the fu function to each row of the dataframe so that the output is :

    myArg   one two
0   10      10  20
1   20      20  20

(sorry for the extra spaced there, added for display reasons).

How do I go about doing this, efficiently?