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    def interpret(self, expression):
        possible_parameters = {'commands': self.commands,
            'expression': expression, 'variables': self.variables}

        try:
            command = self.commands.match(expression)
            args = self._get_args(command.execute)
            params = self._find_parameters(possible_parameters, args)

            return command.execute(**params)
        except Exception, e:
            return e
            return 'null'

...