control of child process stdio

[Frédéric van der Plancke]

How to write a Python script that controls execution of console
Windows/Unix programs (.exe), writing to / reading from them using
their stdin/stdout ?

(For my current problem simplified assumptions hold: the master script
should spawn the program, send fixed-length data to it, wait for at
most a given time, read fixed-length data from the program, then the
program ends itself.
This will be done several times in sequence.)

More-or-less platform-independent solutions are preferred, but I mainly
need a Windows solution...

--
Frederic van der Plancke
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