获取一个Try语句以循环直到获得正确的值 [英] Get a Try statement to loop around until correct value obtained

问题描述

我试图让用户输入1到4之间的数字.我有代码来检查数字是否正确，但是我希望代码循环几次直到数字正确为止.有谁知道如何做到这一点?代码如下:

I am trying to get a user to enter a number between 1 and 4. I have code to check if the number is correct but I want the code to loop around several times until the numbers is correct. Does anyone know how to do this? The code is below:

def Release():


    try:
        print 'Please select one of the following?\nCompletion = 0\nRelease ID = 1\nVersion ID = 2\nBuild ID = 3\n'
        a = int(input("Please select the type of release required: "))
        if a == 0:
            files(a)
        elif a == 1:
            files(a)
        elif a == 2:
            files(a)
        elif a == 3:
            files(a)
        else:
            raise 'incorrect'
    except 'incorrect':    
        print 'Try Again'
    except:
        print 'Error'

Release()

我也收到关于输入的异常的错误:

I am also getting an error about the exception I have entered:

kill.py:20: DeprecationWarning: catching of string exceptions is deprecated
  except 'incorrect':
Error

感谢您的帮助

推荐答案

def files(a):
    pass

while True:
    try:
        i = int(input('Select: '))
        if i in range(4):
            files(i)
            break
    except:    
        pass

    print '\nIncorrect input, try again'

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