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  • Study 7 —— while循环中止语句

    循环的终止语句
    break    #用于完全结束一个循环,跳出循环体执行循环后面的语句
    continue    #只终止本次循环,接着执行后面的循环

    1. 打印0-100,截止到第6次

    count = 0
    while count <= 100:
        print('Value: ', count)
      if count == 5:
    	  break
      count += 1
    

    2. 打印0-100,截止到第6次,第6次无限循环打印

    count = 0
    while count <= 100:
        print('Value: ', count)
        if count == 5:
    	  continue
        count += 1
    

    3. 打印1-5,95-101

    count = 0
    while count <= 100:
        count += 1
        if count > 5 and count < 95:
    	  continue
        print('Value: ', count)
    

    4. 猜年龄,允许用户猜三次,中间猜对跳出循环

    count = 0
    age =18
    
    while count < 3:
        user_guess = int(input('Input Number: '))
        if user_guess == age:
    	  print('Yes, you are right!')
    	  break
        elif user_guess > age:
    	  print('Try smaller!')
        else:
    	  print('Try bigger!')
    
        count += 1
    

    5. 猜年龄,允许用户猜三次,中间猜对跳出循环,猜了三次后若没有猜对,询问是否继续,Y则继续,N则结束

    count = 0
    age =18
    
    while count < 3:
        user_guess = int(input('Input Number: '))
        if user_guess == age:
    	  print('Yes, you are right!')
    	  break
          elif user_guess > age:
    	    print('Try smaller!')
          else:
    	    print('Try bigger!')
          count += 1
    
        if count == 3:
    	  choice = input('Whether or not to continue?(Y/N): ')
    	  if choice == 'Y' or choice == 'y':
    	      count = 0
    	  elif choice == 'N' or choice == 'n':
    	      pass
    	  else:
    	      print('You must input Y/y or N/n !')
    	      pass
    

    6. 帐号密码判断

    ACCOUNT = 'yancy'
    PASSWD = '123!'
    
    count = 0
    
    while count < 1:
        account = input('Enter your account: ')
        passwd = input('Enter your password: ')
    
        if account == ACCOUNT and passwd == PASSWD:
            print('Welcome to the sso system!')
            break
        elif account == ACCOUNT and passwd != PASSWD:
            print('Your password is wrong!')
        elif account != ACCOUNT:
            print("Your account doesn't exist!")
        count += 1
    
        if count == 1:
            while True:
                choice = input('Whether not continue?(Y/N): ')
                if choice == 'Y' or choice == 'y':
                    count = 0
                    break
                elif choice == 'N' or choice == 'n':
                    print('You quit the program!')
                    break
                else:
                    print("You must enter 'Y/y' or 'N/n'!")
                    continue

    while ... else语法

    当while循环正常执行完毕,中间没有被break中止,就会执行else后面的语句

    count = 0
    while count <= 100:
        print('Value: ', count)
        if count == 5:
    	  break       #有break时,else下面的内容就不打印,没有break时,就打印。
        count += 1
    else:
        print('loop is done.')
    

    else语法可用于判断while程序中间是否被break中断跳出

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  • 原文地址:https://www.cnblogs.com/vurtne-lu/p/7805442.html
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