class_docstr: Minimal custom observation space.
code: def contains(self, x):
      return 0 <= x <= 10
  
imports: import time
  from typing import Optional
  import numpy
  import gym
  from gym.spaces import Box, Dict, Discrete, MultiBinary, MultiDiscrete, Tuple
  from gym.utils.seeding import RandomNumberGenerator
label_desc: Use image node_id 2 for calling the CustomSpace obj's underlying member method code with example usage: obj.contains(x) and returns: unknown