docs: def iglob(pathname):
      """
      Return an iterator which yields the same values as glob() without actually
      storing them all simultaneously.
  
      Parameters
      ----------
      pathname : string
          A glob pattern string which will be used for finding files
  
      Returns
      -------
      iterator
          An iterator instance which will yield full path name
  
      """
      dirname = os.path.dirname(pathname)
      basename_pattern = os.path.basename(pathname)
      for root, dirs, files in os.walk(dirname):
          for basename in files:
              if fnmatch.fnmatch(basename, basename_pattern):
                  yield os.path.join(root, basename)