第七天任务 （【基于Python编程从入门到实践】第七章 用户输入和while循环 书本及动手试一试）

第七章 用户输入和while循环

7.1 函数input（ ）的工作原理

7.1.1 编写清晰的程序

7.1.2 使用int( )来获取数值输入

7.1.3 求模运算符

7.1 动手试一试

car = input ("Which car do you want?")

print("Let me see if I can find you a " + car + ".")

customers = input ("How many people eat?")

customers = int (customers)
if customers > 8:
print ("There's an empty table.")
else:
print ("No table available.")

# -*- coding: utf-8 -*

number = input ("输入一个数字：")
number = int (number)

if number % 10 == 0:
print ("该数字是10的整数倍。")
else:
print ("该数字不是10的整数倍。")

7.2 while循环

7.2.1 使用while 循环

7.2.2 让用户选择何时退出

7.2.3 使用标志

7.2.4 使用break退出循环

7.2.5 在循环中使用continue

7.2.6 避免无限循环

7.2 动手试一试

ingredients = "\n Which ingredients do you want?"
ingredients += "\n Enter 'quit' to end the program."

active = True
while  active:
message = input(ingredients)

if message == 'quit' :
active = False
else:
print("\tWe will add " + message.title() + ".")

age = input ("How old are you?")

age = int (age)
if age < 3:
print ("Free.")
elif age >= 3 and age < 12:
print ("Please pay 10 dollars.")
else:
print ("Please pay 15 dollars")

prompt = "\n How old are you?"
prompt += "\n(Enter 'quit' when you are finished.)"

while True:
age = input (prompt)

if age == 'quit':
break
elif age < 3:
print ("Free.")
elif age >= 3 and age < 12:
print ("Please pay 10 dollars.")
else:
print ("Please pay 15 dollars")

7.3 使用whlie循环来处理列表和字典

7.3.1 在列表之间移动元素

7.3.2 删除包含特定值的所有列表元素

7.3.3 使用用户输入来填充字典

7.3 动手试一试

sandwich_orders = ['one','pastrami','two','pastrami','three','pastrami',]
finished_sandwiches = [ ]
while 'pastrami' in sandwich_orders:
sandwich_orders.remove('pastrami')
print (sandwich_orders)

while sandwich_orders:
orders = sandwich_orders.pop()

print ("I made your " + orders + ".")