python 基础 2.8 python练习题

python 练习题：

 

#/usr/bin/python

#coding=utf-8

#@Time   :2017/10/26 9:38

#@Auther :liuzhenchuan

#@File   :练习题.py

 

#实现1--100所有数的和

sum = 0

for i in xrange(1,101):

    sum += i

print sum

>>> 5050

 

#实现1--500 所有奇数的和

js = sum([i for i in xrange(1,501) if i %2 ==1])

print js

>>> 62500

 

 

#求 1+2！+3！+4！+....20!的和

a = xrange(1,21)

b=1

sum3=0

for i in a:

    b *=i

    sum3 +=b

print b

print sum3

>>> 2432902008176640000

    2561327494111820313

 

#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

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