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Michael Rawlinson
1,507 PointsAdding a list - python
How would I add all the numbers in a list, within a function
# add_list([1, 2, 3]) should return 6
def add_list(lists):
for numb in lists:
numb[0] + numb[1] + numb[2]
# summarize([1, 2, 3]) should return "The sum of [1, 2, 3] is 6."
# Note: both functions will only take *one* argument each.
1 Answer
Chris Freeman
Treehouse Moderator 68,468 PointsHi Michael, you're very close. This missing part is to accumulate the total as the for loop runs:
def add_list(lists):
# initialize total to 0
total = 0
for numb in lists:
# Add numb to total
total += numb
# Remember to return a value from the function
return total
Reminder: total += numb is equivalent to total = total + numb