How can i convert below code to int from object in python?

Question

I have been trying to change an object to string, so i first did the below code

total_deliveries_data.Order_ID = map(lambda x : x.str.split('-').str[1].str.split(',').str[0], total_deliveries_data.Order_ID)
total_deliveries_data

when i try the below code to convert the column to in.

total_deliveries_data["Order_ID"] = total_deliveries_data["Order_ID"].astype(str).astype(int)

i get

ValueError: invalid literal for int() with base 10: '<map object at 0x7f9f1f678f10>'

How can i sort this out