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Date: Wed, 20 Aug 2014 09:14:36 +1000
From: Cameron Simpson <cs@zip.com.au>
To: luofeiyu <elearn2014@gmail.com>
Subject: Re: How to look up historical time zones by date and location
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Xref: csiph.com comp.lang.python:76621

On 19Aug2014 09:31, luofeiyu <elearn2014@gmail.com> wrote:
>My dear  friends here, all i want is get   ` LMT+8:06:00`  from the 
>output of tz1  `<DstTzInfo 'Asia/Shanghai' LMT+8:06:00 STD>`
>
>Shall we get back to the main point?

That didn't seem to be your main point. You seemed to want to get Asia/Urumqi 
time by either natural longituide or by Beijing Time, depending on context.

>If you are interested in it ,please say yes or no ,and how to do that ?
>
>import pytz,datetime
>tz1 = pytz.timezone('Asia/Shanghai')
>tz1
><DstTzInfo 'Asia/Shanghai' LMT+8:06:00 STD>
>>>> str(tz1)
>'Asia/Shanghai'

Ah, ok. The Python interperter prints repr(tz1), not str(tz1).

You could extract it from that string, but it would be better to get it from 
the object attributes.

I don't have the pytz module to hand; there seems to be good documentation 
here:

   http://pytz.sourceforge.net/

including example code to get various specific pieces of information out of a 
DstTzInfo object.

Please see if that helps you, and if not, come back.

Cheers,
Cameron Simpson <cs@zip.com.au>

Ignorance is preferable to error; and he is less remote from the truth
who believes nothing, than he who believes what is wrong.
         - Thomas Jefferson