timezones.py 文件源码

def _detect_timezone_etc_localtime():
  matches = []
  if os.path.exists("/etc/localtime"):
    localtime = pytz.tzfile.build_tzinfo("/etc/localtime",
                                         file("/etc/localtime"))

    # See if we can find a "Human Name" for this..
    for tzname in pytz.all_timezones:
      tz = _tzinfome(tzname)

      if dir(tz) != dir(localtime):
        continue

      for attrib in dir(tz):
        # Ignore functions and specials
        if callable(getattr(tz, attrib)) or attrib.startswith("__"):
          continue

        # This will always be different
        if attrib == "zone" or attrib == "_tzinfos":
          continue

        if getattr(tz, attrib) != getattr(localtime, attrib):
          break

      # We get here iff break didn't happen, i.e. no meaningful attributes
      # differ between tz and localtime
      else:
        matches.append(tzname)

    #if len(matches) == 1:
    #  return _tzinfome(matches[0])
    #else:
    #  # Warn the person about this!
    #  warning = "Could not get a human name for your timezone: "
    #  if len(matches) > 1:
    #    warning += ("We detected multiple matches for your /etc/localtime. "
    #                "(Matches where %s)" % matches)
    #  else:
    #    warning += "We detected no matches for your /etc/localtime."
    #  warnings.warn(warning)
    #
    #  return localtime
    if len(matches) > 0:
        return _tzinfome(matches[0])