how to call shell?

Date	2013-02-12 13:12 +0800
Subject	how to call shell?
From	contro opinion <contropinion@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.1682.1360645931.2939.python-list@python.org> (permalink)

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>>> import os
>>> os.system("i=3")
0
>>> os.system("echo $i")

0
>>>
why i can't get the value of i ?

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how to call shell? contro opinion <contropinion@gmail.com> - 2013-02-12 13:12 +0800
  Re: how to call shell? Tim Roberts <timr@probo.com> - 2013-02-11 21:43 -0800

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