system return status on Windows

Fredrik Lundh effbot at telia.com
Fri Feb 25 09:24:06 CET 2000


Milos Prudek <prudek at nembv.cz> wrote:
> Tim Peters wrote:
> >
> > [Milos Prudek
> > You could also try os.spawnv or os.spawnve (but those only exist under
> > Windows).  BTW, don't expect os.popen to work sensibly under Windows
either.
>
> Great, thanks. Could you send something about mode (magic operational
> constant) of spawnv? I do not have Visual C++ Runtime Library
> documentation...

get the eff-bot guide ;-)

# os-spawn-example-3.py

import os
import string

if os.name in ("nt", "dos"):
    exefile = ".exe"
else:
    exefile = ""

def spawn(program, *args):
    try:
        # possible 1.6 shortcut!
        return os.spawnvp(program, (program,) + args)
    except AttributeError:
        pass
    try:
        spawnv = os.spawnv
    except AttributeError:
        # assume it's unix
        pid = os.fork()
        if not pid:
            os.execvp(program, (program,) + args)
        return os.wait()[0]
    else:
        # got spawnv but no spawnp: go look for an executable
        for path in string.split(os.environ["PATH"], os.pathsep):
            file = os.path.join(path, program) + exefile
            try:
                return spawnv(os.P_WAIT, file, (file,) + args)
            except os.error:
                pass
        raise IOError, "cannot find executable"

#
# try it out!

spawn("python", "hello.py")

print "goodbye"

</F>

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