I need to read a list of integers in a csv file, remove the first integer, and find the sum of that list in python

Question

Here's what I have so far

import csv
a= []

with open (r"C:\Users\packe\Downloads\transactions.csv") as f:
    reader = csv.reader(f)
    for column in reader:
        b=int(column[0])
        a. append(b)

transactions.csv contains these integers[25, 2, 8, -5, 4, 4, 3, 2, -2, 3] 25 being the first integer.

Answer 1

You can use this to sum up all elements of a list except the first one:

sum(a_list[1:])

If the elements of the list are strings you can do:

sum(map(int, a_list[1:]))

---

• a_list[1:] this is called slicing, have a look here for an explanation of the syntax.

• map(int, a_list) applies the function int (cast to integer) to all elements of a_list. Link to the docs.