Question

我正在尝试修改一个函数来管理文件结束异常错误。整数函数应该处理EOFError并打印一条消息并将None返回给main（）。然后，必须相应地修改main函数以处理None值。我做了改变但不确定我是否走在正确的轨道上。有人可以给我一些指示吗？感谢

def integer( prompt ):
    value_str = input( prompt )
    try:
        value_int = int( value_str )
    except ValueError:
        print ( "** Invalid input, assuming 0 **" )
        value_int = 0
    except EOFError:
        print("End of file error occurred.")
        return None

    return value_int

def main():
    try:
        numer = integer( "Enter the numerator: " )
        denom = integer( "Enter the denominator: " )
        print( numer, "divided by", denom, end=" " )
        result = numer/denom
        print( "yields", result )

    except ZeroDivisionError:
        print( "** Invalid: attempted to divide by zero **" )
    except EOFError:
        print("unsupported operand type (s) for /: 'int' and 'NoneType'")

    print( "Program halted" )

main()

Answer 1

您的输入语句位于try块之外。将它移到块内＆amp;你应该好好去

def integer( prompt ):
    try:
        value_str = input( prompt )
...

文件结束异常错误

1 个答案: