Python 求和函数

#coding=utf-8
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#求1到10,20到30,30到40之和
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sum=0
for i in range(1,10):
    sum+=i
print("Sum from 1 to 10 is ",sum)
sum=0
for i in range(10,20):
    sum+=i
print("Sum from 1 to 10 is ",sum)