python核心编程2第二章课后练习

#!/usr/etc/env python
string =raw_input("please type the string:\n")
print string

#!/usr/etc/env python
for counter in range(11):
        print counter

#!/usr/etc/env python
value=input("please type the value:\n")
if value>0:
        print "This number is positive"
elif value<0:
        print "This number is negative"
else:
        print "This number is zero"

#!/usr/etc/env python
#-*- coding:utf-8 -*-
string =raw_input("please type the string:\n")
print "for循环完成逐字符显示字符串"
for i in string:
        print i
print "while循环完成逐字符显示字符串"
j=0
while j<len(string):
        print string[j]
        j+=1

#!/usr/etc/env python
#-*- coding:utf-8 -*-
aList =[1,2,3,4,5]
j=0
print "for循环实现输出列表的和"
for i in aList:
        print i
        j+=i
print j
print "while 循环实现输出列表的和"
j=0
i=0
while i<len(aList):
        j+=aList[i]
        print aList[i]
        i+=1
print j

#!/usr/etc/env python
#-*- coding:utf-8 -*-
while True:
        i =input("please type the number:\n")
        if(0<i<100):
                print"success!"
                break
        else:
                pass

#!/usr/etc/env python
#-*- coding:utf-8 -*-
myList =[]
i=0
sum=0
while i<5:
        counter=input("please enter the number:\n")
        myList+=[counter]
        i+=1
while True:
        print"""
        (1)取五个数的和
        (2)取五个数的平均值
        (3)退出
        """
        choose=input("please enter your choose:\n")
        if choose==1:
                for j in range(len(myList)):
                        sum+=myList[j]
                print sum
        elif choose==2:
                for j in range(len(myList)):
                        sum+=myList[j]
                print sum/(len(myList)+1)
        elif choose==3:
                break

print (-2*4)+(3**2)

#!/usr/etc/env python
#-*-coding:utf-8-*-
number1 =input("请输入第一个数值！:\n")
number2 =input("请输入第二个数值！:\n")
number3 =input("请输入第三个数值！:\n")
if number1>number2:
        number2,number1=number1,number2
if number1>number3:
        number3,number1=number1,number3
if number2>number3:
        number3,number2=number2,number3
print number1,number2,number3
number1,number2,number3=number3,number2,number1
print number1,number2,number3