docs: def is_file(self, follow_symlinks=True):
          """
          Return True if this entry is a file or a symbolic link pointing to a
          file; return False if the entry is or points to a directory or other
          non-file entry, or if it doesn’t exist anymore.
  
          The result is cached on the os.DirEntry object.
  
          Args:
              follow_symlinks (bool): Follow symlinks.
                  Not supported on cloud storage objects.
  
          Returns:
              bool: True if directory exists.
          """
          return self._system.isfile(
              path=self._path, client_kwargs=self._client_kwargs)