How to constuct a column of data frame recursively with pandas-python?

Question

Give such a data frame df:

id_      val     
11111    12
12003    22
88763    19
43721    77
...

I wish to add a column

Answer 1

if you are using apply in pandas, you should not be using the dataframe again within the lambda function.

your object in all cases within the lambda function should be 'row'.