docs: def update_stored_win32tz_map():
    """Downloads the cldr win32 timezone map and stores it in win32tz_map.py."""
    windows_zones_xml = download_cldr_win32tz_map_xml()
    source_hash = hashlib.md5(windows_zones_xml).hexdigest()
  
    if hasattr(windows_zones_xml, "decode"):
      windows_zones_xml = windows_zones_xml.decode("utf-8")
  
    map_zones = create_win32tz_map(windows_zones_xml)
    map_dir = os.path.dirname(os.path.abspath(__file__))
    map_filename = os.path.join(map_dir, "win32tz_map.py")
    if os.path.exists(map_filename):
      reload(win32tz_map)
      current_hash = getattr(win32tz_map, "source_hash", None)
      if current_hash == source_hash:
        return False
  
    map_file = open(map_filename, "w")
  
    comment = "Map between Windows and Olson timezones taken from %s" % (
        _CLDR_WINZONES_URL,)
    comment2 = "Generated automatically from datetime_tz.py"
    map_file.write("'''%s\n" % comment)
    map_file.write("%s'''\n" % comment2)
  
    map_file.write("source_hash = '%s' # md5 sum of xml source data\n" % (
        source_hash))
  
    map_file.write("win32timezones = {\n")
    for win32_name, territory, olson_name, comment in map_zones:
      if territory == '001':
        map_file.write("  %r: %r, # %s\n" % (
            str(win32_name), str(olson_name), comment or ""))
      else:
        map_file.write("  %r: %r, # %s\n" % (
            (str(win32_name), str(territory)), str(olson_name), comment or ""))
    map_file.write("}\n")
  
    map_file.close()
    return True