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how to call shell?

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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

#38725 — how to call shell?

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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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#38730

contro opinion <contropinion@gmail.com> wrote:
>
>>>> import os
>>>> os.system("i=3")
>0
>>>> os.system("echo $i")
>
>0
>>>>
>why i can't get the value of i ?

Each invocation of os.system creates a brand new shell that starts, runs,
and terminates.  Your first command adds a variable "i" to the environment
for that shell, but the variable is deleted when the shell procsess
terminates.
-- 
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

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