code: def load_conf():
      
      try:
          conf = copy.copy(default_conf)
          conf.update(json.load(open(get_conf_filename())))
          conf.update(read_environment())
          return conf
      except IOError as e:
          create_default_conf()
          return load_conf()
docs: Load the configuration with the priority:
          1. environment variables
          2. configuration file
          3. defaults here (default_conf)