python 时区 dateutil

记录下python中的时区问题， 代码如下：

from datetime import datetime

from dateutil import tz, zoneinfo

if __name__ == '__main__':
    zonefile = zoneinfo.get_zonefile_instance()
    print zonefile.zones.keys()

    tz_dubai = tz.gettz('Asia/Dubai')
    tz_sh = tz.gettz('Asia/Shanghai')
    now_sh = datetime.now(tz=tz_sh)
    print now_sh

    now_dubai = datetime.now(tz=tz_dubai)
    print now_dubai
    
    print now_dubai.astimezone(tz_sh)
    print 'done!'