How to use the gym.utils.seeding.np_random function in gym

def _seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)

        # Update the random policy if needed
        if isinstance(self.opponent, str):
            if self.opponent == 'random':
                self.opponent_policy = make_random_policy(self.np_random)
            else:
                raise error.Error('Unrecognized opponent policy {}'.format(self.opponent))
        else:
            self.opponent_policy = self.opponent

        return [seed]

def seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def _seed(self, seed=None):
        """Sets the seed for this env's random number generator(s).

            Note:
                    Some environments use multiple pseudorandom number generators.
                    We want to capture all such seeds used in order to ensure that
                    there aren't accidental correlations between multiple generators.

            Returns:
                    list: Returns the list of seeds used in this env's random
                        number generators. The first value in the list should be the
                        "main" seed, or the value which a reproducer should pass to
                        'seed'. Often, the main seed equals the provided 'seed', but
                        this won't be true if seed=None, for example.
            """
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def _seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def _seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def _seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def _seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]

def _seed(self, seed=None):
        self.np_random, seed = seeding.np_random(seed)
        return [seed]