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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 set(self, key, value):
 """ Sets the value for a specific requirement. :param key: Name of requirement to be set :param value: Value to set for requirement key :return: Nothing, modifies requirement """

        if key == "tags":
            self._set_tag(tags=value)
        else:
            if isinstance(value, dict) and key in self._requirements and isinstance(
                    self._requirements[key], dict):
                self._requirements[key] = merge(self._requirements[key], value)
            else:
                self._requirements[key] = value