docs: def load_dotenv(dotenv_path, verbose=False):
      """
      Read a .env file and load into os.environ.
  
      :param dotenv_path:
      :type dotenv_path: str
      :param verbose: verbosity flag, raise warning if path does not exist
      :return: success flag
      """
      if not os.path.exists(dotenv_path):
          if verbose:
              warnings.warn(f"Not loading {dotenv_path}, it doesn't exist.")
          return None
      for k, v in dotenv_values(dotenv_path).items():
          os.environ.setdefault(k, v)
      return True