code: def preprocess_dict(d):
      '''
      Preprocess a dict to be used as environment variables.
  
      :param d: dict to be processed
      '''
  
      out_env = {}
      for k, v in d.items():
  
          if not type(v) in PREPROCESSORS:
              raise KeyError('Invalid type in dict: {}'.format(type(v)))
  
          out_env[k] = PREPROCESSORS[type(v)](v)
  
      return out_enf preprocess_dict(d):
      '''
      Preprocess a dict to be used as environment variables.
  
      :param d: dict to be processed
      '''
  
      out_env = {}
      for k, v in d.items():
  
          if not type(v) in PREPROCESSORS:
              raise KeyError('Invalid type in dict: {}'.format(type(v)))
  
          out_env[k] = PREPROCESSORS[type(v)](v)
  
      return out_env
docs: Preprocess a dict to be used as environment variables.
  
      :param d: dict to be processed