7.3 使用while 循環來處理列表和字典

# 7.3.1 在列表之間移動元素

# confirmed_users.py

# 首先，建立一個待驗證用戶列表

# 和一個用於存儲已驗證用戶的空列表

uncomfirmed_users = ['james','star','wendy']

comfirmed_users = []

# 驗證每一個用戶，直到沒有未驗證用戶爲止

# 將每一個通過驗證的列表都移到已驗證用戶列表中

while uncomfirmed_users:
　　current_user = uncomfirmed_users.pop()  # pop.() 默認移除列表中最後一個元素

　　print("Verifying use: " + current_user.title())
　　comfirmed_users.append(current_user)  # 空列表已經在這段碼塊中更新
# 顯示全部已驗證的用戶
print("\nThe following users have been comfirmed:")
for comfirmed_user in comfirmed_users:
　　print(comfirmed_user.title())

 

# 7.3.2 刪除包含特定值的全部列表元素
#pets.py
pets = ['dog','cat','goldfish','cat','rabbit','tigger','cat','chick']

# 循環尋找列表中的'cat'，而且移除全部'cat'，直到列表中沒有這條信息

while 'cat' in pets:
　　pets.remove('cat')

print(pets)

# 7.3.3 使用用戶輸入來填充字典
# mountain_poll.py
responses = {}
polling_active = True

while polling_active:

# input()函數，提示用戶須要輸入信息
name = input("What's your name?")
response = input("Which mountain would you like to climb someday?")

# 字典 {'keys','values'} 等效於 keys = values,name = response

responses[name] = response

repeat = input("would you like to let another person repond? (yes/no)")
if repeat == 'no':
polling_active = False

print("\n---Poll Result---")
for name, response in responses.items():
print(name.title() + " would like to climb " + response + ".")

# 7-8 熟食店
sandwich_orders = ['tomato','potato','vegetable']
finished_sandwiches = []

while sandwich_orders:
　　current_sandwich = sandwich_orders.pop()

print(current_sandwich + ", I made your tuna sandwich.")
finished_sandwiches.append(current_sandwich)

print("All the sandwiches are finished.")
for finished_sandwich in finished_sandwiches:
　　print(finished_sandwich.title())

# 7-9 五香菸薰牛肉
sandwich_orders = ['tomato','pastrami','potato','pastrami','vegetable','pastrami']
finished_sandwiches = []
while 'pastrami' in sandwich_orders:
　　sandwich_orders.remove('pastrami')

print("Pastrami sold out!")

while sandwich_orders:
　　current_sandwich = sandwich_orders.pop()

print(current_sandwich + ", I made your tuna sandwich.")
finished_sandwiches.append(current_sandwich)

print("All the sandwiches are finished.")
for finished_sandwich in finished_sandwiches:
　　print(finished_sandwich.title())

# 7-10 夢想的度假勝地

responses = {}

polling_active = Truewhile polling_active: 　　name = input("What's your name?") response = input("If you could visit one place in the world," + " where would you go?") responses[name] = response repeat = input("Would you like to let another person respond? (yes/no) ") if repeat == 'no': 　　polling_active = False print("---Poll Result---")for name, response in responses.items(): 　　print(name.title() + " would like to visit " + response + ".")