python入门-WHILE循环
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1 使用while循环
current_number= 1 while current_number <= 5: print(current_number) current_number += 1
2 让用户选择退出
prompt = "tell me somthing, and i will repeat it back to you" prompt = " Enter ‘quit‘ to end the program" message = "" while message != ‘quit‘: message=input(prompt) if message!=‘quit‘: print(message)
3 使用标志
prompt = "tell me somthing, and i will repeat it back to you" prompt = " Enter ‘quit‘ to end the program" active = True while active: message = input(prompt) if message == ‘quit‘: active = False else: print(message)
4 使用break退出循环
prompt = " Please enter the name of a city you have visited:" prompt += " (enter ‘quit‘ when you are finished.)" while True: city = input(prompt) if city == ‘quit‘: break else: print("I‘d love to go to" + city.title() + "!")
5 在循环中使用continue
current_number = 0 while current_number < 10: current_number += 1 if current_number % 2 ==0: continue print(current_number)
6 使用while循环来处理列表和字典
unconfirmed_users = [‘alice‘,‘brian‘,‘candace‘] confirmed_users = [] while unconfirmed_users: current_user = unconfirmed_users.pop() print("verifying user:" + current_user.title()) confirmed_users.append(current_user) print(" the following users have been confirmed:") for confirmed_user in confirmed_users: print(confirmed_user.title())
7 删除特定的列表元素
pets = [‘dog‘,‘cat‘,‘dog‘,‘goldfish‘,‘cat‘,‘rabbit‘,‘cat‘] print(pets) while ‘cat‘ in pets: pets.remove(‘cat‘) print(pets)
8使用用户输入来填充字典
responses = {} polling_active = True while polling_active: name = input(" what is your name?") response = input("which mountain would you like to climb someday") responses[name] = response repeat = input("would you like to let another person respond?(yes or no") if repeat == ‘no‘: polling_active = False print(" --poll results--") for name,response in responses.items(): print(name + "would like to climb" + response + ".")
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