code: def get_spontaneous_environment(*args):
      
      try:
          env = _spontaneous_environments.get(args)
      except TypeError:
          return Environment(*args)
      if env is not None:
          return env
      _spontaneous_environments[args] = env = Environment(*args)
      env.shared = True
      return env
docs: Return a new spontaneous environment.  A spontaneous environment is an
      unnamed and unaccessible (in theory) environment that is used for
      templates generated from a string and not from the file system.