python 循环小例子

标签：python

1. 实现1-100的所有的和

sum = 0

for i in xrange(1,101):

   sum+=i

print(sum)

结果：

5050

2. 实现1-500所有奇数的和

sum = 0

for i in xrange(1,501):

   if i%2 == 1:

       sum+=i

print(sum)

结果：

62500

3. 求1+ 2! + 3! + 4! + ……20！的和

sum = 0

chengji = 1

for i in xrange(1,21):

   chengji=chengji*i

   sum = sum + chengji

print(chengji)

print(sum)

结果：

2432902008176640000

2561327494111820313

4. 对指定一个list进行排序[2,32,43,453,54,6,576,5,7,6,8,78,7,89]

list1= [2,32,43,453,54,6,576,5,7,6,8,78,7,89]

list1.sort()

print(list1)

list1.reverse()

print(list1)

结果：

[2, 5, 6, 6, 7, 7, 8, 32, 43, 54, 78, 89, 453, 576]

[576, 453, 89, 78, 54, 43, 32, 8, 7, 7, 6, 6, 5, 2]

python 循环小例子

标签：python

原文地址：http://huangzp.blog.51cto.com/12434999/1976511