if no other command was invoked

def default(self, user_input):
        ''' if no other command was invoked '''
        try:
            for i in self._cs.disasm(unhexlify(self.cleanup(user_input)), self.base_address):
                print("0x%08x:\t%s\t%s" %(i.address, i.mnemonic, i.op_str))
        except CsError as e:
            print("Error: %s" %e)