#coding=utf-8#函数input()让程序暂停运行，等待用户输入一些文本。得到用户的输入以后将其存储在一个变量中，方便后续使用name=input("Please Enter Your Name:")print("Hello!"+name+"!Welcome to Python world!") prompt = "If you tell us who you are, we can personalize the messages you see.\nWhat is your first name:"name=input(prompt)print("Hello!"+name+"!") #将数字的字符串表示转换为数值 int()age=input("How old are you?")age=int(age)if age < 18:    print("Deny")elif age >= 18 and age <= 60:    print("Access")else:    print("Sorry")  #求模运算符 % 返回余数 #while循环current_number = 1while current_number <= 5:    print("current_number:"+str(current_number))    current_number += 1;#注意python中没有++操作，究其原因，python中变量是以内容为基准而不是像 c 中以变量名为基准    #使用标志active=Truewhile active:    message = input(prompt)    if message == 'quit':        active = False    else:        print(massage) #使用break退出循环while True:    message = input(prompt)    if message == 'quit':        break    else:        print(massage) #使用continue 和其他语言的break、continue用法都一样#避免无限循环，也就是说要注意循环的条件#如果陷入了无限循环，可以按Ctrl+C，与Linux中命令一样 #使用while循环来出列列表和字典#在列表之间移动元素unconfirmed_users=['alice','bob','candy']confirmed_users=[]while unconfirmed_users:    current_user = unconfirmed_users.pop()        print("Verifying user:"+current_user.title())    confirmed_users.append(current_user)    print("\nThe following users have been confirmed:")for confirmed_user in confirmed_users:    print(confirmed_user.title()) #删除包含特定值的所有列表元素#remove()删除列表中特定值只删除第一个匹配的，无法删除多个；如果想全部删除，通过遍历来删除pets=['dog','cat','panda','fish','rabbit','cat']print(pets)while 'cat' in pets:    pets.remove('cat')    print(pets) #使用用户输入来填充字典responses = {}polling_active = Truewhile polling_active :    name = input("Name:")    response = input("Response:")        responses[name] = response        repeat = input("yes or no:")    if repeat == 'no':        polling_active = False        print(responses)