code: def _get_environ_overrides() -> Dict[str, str]:
      
      return {
          ce.name: os.environ['OT_API_' + ce.name.upper()]
          for ce in CONFIG_ELEMENTS
          if 'OT_API_' + ce.name.upper() in os.environ}
docs: Pull any overrides for the config elements from the environ and return
      a mapping from the names to the values (as strings). Config elements that
      are not overridden will not be in the mapping.