win32: popen works, popen3 causes hang

[David Bolen]

"G. Willoughby" <never at mind.info> writes:

> i think os.popen3 returns a tuple of file objects, so to use this command
> correctly it should be coded like this:
> 
> childstdin, childstdout, childstderr = os.popen3("spectrum.exe -file
> script.tcl")

How you store the results really doesn't matter.  In your example,
you're doing tuple unpacking, which I agree is generally convenient
and provides a simple way to name elements of the tuple, but there's
nothing "wrong" with just binding a name to the tuple itself.  E.g.,

    output = os.popen3("spectrum.exe -file script.tcl")

is just fine - output is just a tuple in that case.

> to read the error stream use childstderr.read() etc..

The equivalent to that would then be output[2].read().

--
-- David
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