How do you find the sum of specific items in a 2d array with a foreach loop?-CodePudding

i have this list: list = [('a',1), ('b',2), ('c',3)]

how can i write a foreach loop to find the sum of 1 2 3?

CodePudding user response：

Simplest approach:

list = [('a',1), ('b',2), ('c',3)]

summ = 0 # variable to store sum
for i in list:
    summ = summ   i[1]

print(summ)

This returns 6

CodePudding user response：

Short approach using a comprehension:

items = [('a', 1), ('b', 2), ('c', 3)]
print(sum(item[1] for item in items))

Please avoid naming your list list, it's the name of the list type in Python, so you're "hiding" the list type, which can cause strange bugs if you need the real list later.