text: import numpy as np
  import gym
  
  class Discrete(gym.Space):
      """
      {0,1,...,n-1}
  
      Example usage:
      self.observation_space = spaces.Discrete(2)
      """
      def __init__(self, n):
          self.n = n
          gym.Space.__init__(self, (), np.int64)
      def sample(self):
          # return self.n/3 + gym.spaces.np_random.randint(self.n/3)
          #return gym.spaces.np_random.randint(self.n)
          return 50
      def contains(self, x):
          if isinstance(x, int):
              as_int = x
          elif isinstance(x, (np.generic, np.ndarray)) and (x.dtype.kind in np.typecodes['AllInteger'] and x.shape == ()):
              as_int = int(x)
          else:
              return False
          return as_int >= 0 and as_int < self.n
      def __repr__(self):
          return "Discrete(%d)" % self.n
      def __eq__(self, other):
          return self.n == other.n
  