Handling user defined exceptions in Python

 # we'll define a base class for user-defined exception handling

class Error(Exception):

    """Base class for user-defined exception..."""

    pass

class ValueTooSmallError(Error):

    """Value is smaller than expected"""

    pass

class ValueTooLargeError(Error):

    """Value is larger than expected"""

    pass

num=46

while True:

    try:

        user_input=int(input("Guess the number?:"))

        assert isinstance(user_input, int)

        if user_input<num:

            raise ValueTooSmallError()

        elif user_input>num:

            raise ValueTooLargeError()

        break

    except ValueTooLargeError as e:

        print(e.__doc__,"\n",)

       

    except ValueTooSmallError as e:

        print(e.__doc__,"\n")

    except:

        print("Some error occured! Try again\n")    

 

print("Congo!!! You guessed it correctly.")