Create multiple columns from multiple return value of lambda function in python DataFrame

Question

Att, I want to create multiple columns from lambda function\'s multiple return values in python DataFrame.

Similar with the last line of my demo code.

Is there

Answer 1

An alternative to using pd.Series is to turn the output into a list. You can then assign the new columns as:

df[['slope', 'R2']] = pd.DataFrame(df.apply(lambda x: f_polyfit(x)).tolist(), 
index=df.index)