"""===========================
exercise 10.1
==========================="""
def cumul_sum(original):
new = []
running_total = 0
for number in original:
running_total = running_total + number
new.append(running_total)
return new
old_list = [1,2,3]
print old_list
new_list = cumul_sum(old_list)
print new_list
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