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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def verify(self, msg, signature, key):
 """ Verifies whether signature is a valid signature for message :param msg: the message :type msg: bytes :param signature: The signature to be verified :type signature: bytes :param key: The key :return: True is the signature is valid otherwise False """


        if not isinstance(key, rsa.RSAPublicKey):
            raise TypeError(
                "The public key must be an instance of RSAPublicKey")
        try:
            key.verify(signature, msg, self.padding, self.hash)
        except InvalidSignature as err:
            raise BadSignature(str(err))
        except AttributeError:
            return False
        else:
            return True