【Python编程：从入门到实践】用户输入和while循环

用户输入和while循环

• input()
• int()
• while 循环
• • break
• • continue
• • active_status =True
• • 删除列表重复元素
• • 结合字典和列表

7.1 input() int()

message = input("hehehe:")#100
num = int(message)+100
print(num)#200

7.2 even_or_odd %

if int(input("num:"))%2==0:
    print("even")
else:
    print("odd")

7.3 while loop

count_num = 0
sum = 0
while count_num<11:
    sum += count_num
    count_num += 1
print(sum)#55

7.4 用户输入某一数据时停止

# 用户输入quit时停止循环
message = ""
while message!='quit':
    message = input()
    print(message)

7.5 使用break退出循环

while True:
    message = input()
    if message == 'quit':
        break
    else:
        print(message)

7.5 使用continue进入下一次循环

while True:
    message = input()
    if message == 'exit':
        break
    elif message == 'pause':
        continue
    else:
        print(message)

7.6 列表中元素移动

animal_1 = ['dog','cat','lion','panda','bear','tiger','cow','sheep','pig']
animal_2 = []
while animal_1:
    animal_2.append(animal_1.pop()) 
print(animal_1)
# []
print(animal_2)
# ['pig', 'sheep', 'cow', 'tiger', 'bear', 'panda', 'lion', 'cat', 'dog']

7.7 删除列表中多项重复元素

animal_3 = ['dog','pig','cat','lion','pig','bear','tiger','cow','sheep','pig']
while 'pig' in animal_3:
    animal_3.remove('pig')
print(animal_3)
#['dog', 'cat', 'lion', 'bear', 'tiger', 'cow', 'sheep']

7.8 使用用户输入来填充字典

responses = {}
active_status = True
while active_status:
    name = input("\nplease input your name:")
    response = input("which mountain would you like?")

    responses[name] = response

    repeat = input("yes or no :")
    if repeat == 'no':
        active_status = False
for name,response in responses.items():
    print(name,response)

# please input your name:libing
# which mountain would you like?taishan
# yes or no :yes
# please input your name:zhoujielun
# which mountain would you like?huashan
# yes or no :yes
# please input your name:lixiaolong
# which mountain would you like?wudangshan
# yes or no :no
# libinglin taishan
# zhoujielun huashan
# lixiaolong wudangshan

7.9 熟食店

sandwich_orders = ['beef','cheese','fish']
finished_sandwiches = []
while sandwich_orders:
    sandwich = sandwich_orders.pop()
    print('i made your '+sandwich+' sandwich')
    finished_sandwiches.append(sandwich)
for a in finished_sandwiches:
    print(a)
# i made your fish sandwich
# i made your cheese sandwich
# i made your beef sandwich
# fish
# cheese
# beef

7.10 五香烟熏牛肉三明治卖完了

sandwich_orders = ['pastrami','beef','pastrami','cheese','fish','pastrami']
print("五香牛肉三明治卖完了")
while 'pastrami' in sandwich_orders:
    sandwich_orders.remove('pastrami')
print(sandwich_orders)
# 五香牛肉三明治卖完了
# ['beef', 'cheese', 'fish']