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#char 7 用户输入和while循环

message=input('tell me something, and i will repeat it to you:')

print(message)

#input接受一个参数，即要向用户显示的提示或者说明，即用户可以看到引号中的内容再进行输入

#输入内容储存再变量中再进行输出

name=input('please enter your name: ')

print('hello'+name+"!")

prompt="if you tell us who you are ,we can personalize the message you see."

prompt += "\n what is your first name?"

name= input(prompt)

print("\n hello, "+name+"!")

#使用Int()来获取数值输入

age=input('how old are you?')

age=int(age)

print(age>=20)

#即是通过输入的都是以字符串的形式，若是以字符串的形式比大小会报错，用Int转换格式

height=input(' how tall are you , in inches?')

height=int(height)

if height>=36:

print('\n you are tall enough to ride!')

else:

print('\n you will be able to ride when you are a liittle older')

#求模运算符

print(4%3)

print(5%3)

#通过输入判断奇数或者偶数

number=input('enter a number, and i will tell you if it is even or odd')

number=int(number)

if number%2==0:

print('the number'+str(number)+'is even')

else:

print('the number'+str(number)+'is odd')

#7-4:

prompt='please print a series of toppings'

prompt+='if enouth print "quit" '

while True:

toppings=input(prompt)

if toppings=='q':

break

else:

print('we will add'+toppings+'into your pizza')

#7-5:

ask='How old are you ?'

ask+="input 'quit' if you want to end"

while True:

age=input(ask)

if age=="quit":

break

if int(age)<3:

print('you are free for the movies')

elif int(age)<12:

print('you shoulf cost 10 dollors for the movies')

else:

print('you shoulf cost 15 dollors for the movies')

#7-6(1):

active=True

prompt='please print a series of toppings'

prompt+='if enouth print "quit" '

while active:

toppings=input(prompt)

if toppings=='quit':

active=False

else:

print('we will add '+toppings+' into your pizza')

#7-6(2):

ask='How old are you ?'

ask+="input 'quit' if you want to end"

active=True

while active:

age=input(ask)

if age=="quit":

active=False

elif int(age)<3:

print('you are free for the movies')

elif int(age)<12:

print('you shoulf cost 10 dollors for the movies')

else:

print('you shoulf cost 15 dollors for the movies')

#7-8

sandwich_order=['pork','chiceken','beef','eeg']

finised_sandwiches=[]

while sandwich_order:

current_sandwich=sandwich_order.pop()

print("i made your sandwich with"+current_sandwich)

finised_sandwiches.append(current_sandwich)

print(finised_sandwiches)

#7-9

sandwich_order=['pork','psatrami','chiceken','psatrami','beef','psatrami','eeg']

print('the psatrami has sold old ')

while 'psatrami' in sandwich_order:

sandwich_order.remove('psatrami')

print(sandwich_order)

# 7-10

responses={}

print('If you could visit one place in the world , where would you go?')

polling_active=True

while polling_active:

name=input('\n What is your name ')

response=input('where woulf you like to go someday?')

responses[name]=response

repeat=input('if you want another one to continue?(yes/no)')

if repeat=='no':

polling_active=False

print("--------polling results----------")

for name, response in responses.items():

print(name+" would like to go "+response.title())

while循环部分

#7.2while循环

current_number=1

while current_number<=5:

print(current_number)

current_number += 1

#用户选择何时退出

#后采用message != 'quit' 就不打印message信息，防止每条都打印了message的信息

prompt='tell me something, and i will repeat it to you:'

prompt+='\n enter a quit if you want to end'

message=" "

while message !='quit':

message=input(prompt)

if message !='quit':

print(message)

#使用标志与用break退出循环

#将active设置为True 和 False 的状态变量，通过根据其值来决定while的判断

prompt='tell me something, and i will repeat it to you:'

prompt+='\n enter a quit if you want to end'

active=True

while active:

message=input(prompt)

if message =='quit':

active=False

else:

print(message)

prompt='\n please tnter the name of a city you have visited:'

prompt='\n (enter quit when you finish.)'

while True:

city=input(prompt)

if city=='quit':

break

else:

print('i would like to go to '+city.title()+" !")

#在循环中使用continue

#通过continue使循环中部分符合条件的statement跳过循环执行

current_number=0

while current_number <10:

current_number +=1

if current_number%2==0:

continue

print(current_number)

#用while处理列表和字典

#在列表中之间移动元素

unconfirmed_users=['alice','brain','candace']

confirmed_users=[]

while unconfirmed_users:

current_user=unconfirmed_users.pop()

print("Verifying user: "+current_user.title())

confirmed_users.append(current_user)

print("\n the following users have been confirmed")

for confirmed_user in confirmed_users:

print(confirmed_user.title())

#删除包含特定的元素

pets=['dog','cat','dog','goldfish','cat','rabbit','cat']

print(pets)

while 'cat' in pets:

pets.remove('cat')

#使用这用户输入填充字典

responses={}

polling_active=True

while polling_active:

name=input('What is your name?')

response=input('which mountaiin would you like to clime someday ')

responses[name]=response

repeat=input('would you like to let other person.(yes/no)')

if repeat=='no':

polling_active=False

print('\n--------poll results-----')

for name,response in responses.items():

print(name+'would you like to climb '+response+".")

课后练习

课后题由7-4开始

#7-4:

prompt='please print a series of toppings'

prompt+='if enouth print "quit" '

while True:

toppings=input(prompt)

if toppings=='q':

break

else:

print('we will add'+toppings+'into your pizza')

#7-5:

ask='How old are you ?'

ask+="input 'quit' if you want to end"

while True:

age=input(ask)

if age=="quit":

break

if int(age)<3:

print('you are free for the movies')

elif int(age)<12:

print('you shoulf cost 10 dollors for the movies')

else:

print('you shoulf cost 15 dollors for the movies')

#7-6(1):

active=True

prompt='please print a series of toppings'

prompt+='if enouth print "quit" '

while active:

toppings=input(prompt)

if toppings=='quit':

active=False

else:

print('we will add '+toppings+' into your pizza')

#7-6(2):

ask='How old are you ?'

ask+="input 'quit' if you want to end"

active=True

while active:

age=input(ask)

if age=="quit":

active=False

elif int(age)<3:

print('you are free for the movies')

elif int(age)<12:

print('you shoulf cost 10 dollors for the movies')

else:

print('you shoulf cost 15 dollors for the movies')

#7-8

sandwich_order=['pork','chiceken','beef','eeg']

finised_sandwiches=[]

while sandwich_order:

current_sandwich=sandwich_order.pop()

print("i made your sandwich with"+current_sandwich)

finised_sandwiches.append(current_sandwich)

print(finised_sandwiches)

#7-9

sandwich_order=['pork','psatrami','chiceken','psatrami','beef','psatrami','eeg']

print('the psatrami has sold old ')

while 'psatrami' in sandwich_order:

sandwich_order.remove('psatrami')

print(sandwich_order)

# 7-10

responses={}

print('If you could visit one place in the world , where would you go?')

polling_active=True

while polling_active:

name=input('\n What is your name ')

response=input('where woulf you like to go someday?')

responses[name]=response

repeat=input('if you want another one to continue?(yes/no)')

if repeat=='no':

polling_active=False

print("--------polling results----------")

for name, response in responses.items():

print(name+" would like to go "+response.title())