code: def load_file(self, path=None, env=None, silent=True, key=None):
          
          env = (env or self.current_env).upper()
          files = ensure_a_list(path)
          if files:
              self.logger.debug("Got %s files to process", files)
              already_loaded = set()
              for _filename in files:
                  self.logger.debug("Processing file %s", _filename)
                  filepath = os.path.join(self._root_path, _filename)
                  self.logger.debug("File path is %s", filepath)
                  # Handle possible *.globs sorted alphanumeric
                  for path in sorted(glob.glob(filepath)):
                      self.logger.debug("Loading %s", path)
                      if path in already_loaded:  # pragma: no cover
                          self.logger.debug("Skipping %s, already loaded", path)
                          continue
                      settings_loader(
                          obj=self,
                          env=env,
                          silent=silent,
                          key=key,
                          filename=path,
                      )
                      already_loaded.add(path)
              if not already_loaded:
                  self.logger.warning(
                      "Not able to locate the files %s to load", files
                  )
docs: Programmatically load files from ``path``.
  
          :param path: A single filename or a file list
          :param env: Which env to load from file (default current_env)
          :param silent: Should raise errors?
          :param key: Load a single key?