第九天学习：简单的练习题

#!/usr/bin/env python
sum = 0
for i in xrange(1,101):
    sum += i
print(sum)

#!/usr/bin/env python
l = [i for i in xrange(1,501) if i%2 != 0]
sum = 0
for i in l:
    sum += i
print(sum)

#!/usr/bin/python
def fac(x):
    mul = 1
    for i in range(1,x+1):
        mul *= i
    return mul
sum = 0
for i in range(1,21):
    sum += fac(i)
print(sum)

>>> li = [2,32,43,453,54,6,576,5,7,6,8,78,7,89]
>>> li.sort()
>>> li
[2, 5, 6, 6, 7, 7, 8, 32, 43, 54, 78, 89, 453, 576]