CPSC 121 Fall 2012 Lecture Notes: Random Numbers and Sublist Sum, Study notes of Computer Science

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• Random numbers

Homework

• HW 7 due
• HW 8 out

Exercise: More nested loop practice

Write a function called sublist sum(a list) that takes a list whose elements are lists of ints and returns the sum of all the values in each sublist. For example:

sublist_sum([[1,2], [2,3], [3,4]]) 15

sublist_sum([[1,2,3], [4,5,6]]) 21

Hint: Use a nested loop! Use either value loops or range loops

Answer:

def sublist_sum(a_list): total = 0 for sublist in a_list: for elem in sublist: total = total + elem return total