Writing to open subprocess pipes.

[Stephen Hansen]

On 6/16/10 1:29 PM, Brandon McGinty wrote:
> Both subprocess and os.popen* only allow inputput and output one time,
> and the output to be read only when the process terminates.

Its not that subprocess only *allow* input and output one at a time, but
that it a) provides blocking file objects by default, and b) those only
read until EOF.

It also provides *convenience* methods for the common case of writing
output once and receiving everything back, but that's not the only way
you can use it.

If you want a bidirectional write/read for awhile, you really just need
to switch those file objects to non-blocking and such.

I found this useful when I needed to do it:
http://code.activestate.com/recipes/440554/

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/

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