未正确处理异常

Question

我的异常处理似乎没有正常工作。当我输入一个字符串作为输入时，没有出现正确的异常。当我输入负数时，我遇到了同样的问题。有谁知道如何解决这个问题？

我尝试更改引发异常的条件，但仍然没有找到解决问题的方法。

def main():
    try:
        height = int(input())
        check_height = type(height)
        if height == 0 or height > 999:
            raise Exception
        elif check_height != int:
            raise TypeError
        elif height < 0:
            raise ValueError
        else:
            for blocks in range(height):
                if blocks == 0:
                    print ("+-+")
                    print ("| |")
                    print ("+-+", end = "")
                else:
                    print ("-+")
                    for num in range(blocks):
                        print("  ", end = "")
                    print ("| |")
                    for num in range(blocks):
                        print("  ", end = "")
                    print ("+-+", end = "")
            print("\n")

    except Exception:
        print("Value can't be equal to 0 or greater than 999")
    except TypeError:
        print("Value is not an integer")
    except ValueError:
        print("Value is less than 0")
    finally:
        pass

main()

如果输入的输入是 1，预期的输出应该是一个如下所示的块：（请参见上面的输出屏幕截图）

Answer 1

您的异常处理有问题。由于您正在尝试将输入本身转换为整数，因此如果输入无法转换为整数，它会在此处抛出 ValueError 。而且您没有任何 ValueError 异常处理，因此它会转到默认异常块。试试这个方法：

try:
    height = int(input())
    # check_height = type(height)
    if height <= 0 or height > 999:
        raise Exception
    # elif check_height != int:
    #     raise TypeError
    # elif height < 0:
    #    raise ValueError
    else:
        for blocks in range(height):
            if blocks == 0:
                print ("+-+")
                print ("| |")
                print ("+-+", end = "")
            else:
                print ("-+")
                for num in range(blocks):
                    print("  ", end = "")
                print ("| |")
                for num in range(blocks):
                    print("  ", end = "")
                print ("+-+", end = "")
        print("\n")
except ValueError:
    print("Value is not an integer")
# except TypeError:
#     print("Value is not an integer")
except Exception:
    print("Value can't be less than 1 or greater than 999")
finally:
    pass

未正确处理异常

Exceptions not being handled correctly

python

exception

python-3.7