题目：

Summation

Write a program that finds the summation of every number from 1 to num. The number will always be a positive integer greater than 0.

For example:

summation(2) -> 3

1 + 2

summation(8) -> 36

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8

解题方法：

很简单的题目：

def summation(num):

    return sum([x for x in range(num+1)])

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