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Here's another test, taken from the docs:
http://docs.python.org/library/subprocess.html#subprocess-replacements:
This is slightly better than Popen because the program executes and
shows output, but worse than os.system(), because it still shows the error:
--------------------------
try:
 retcode = call("echo" + " \"hello world\"", shell=True)
 if retcode < 0:
 print >>sys.stderr, "Child was terminated by signal",
-retcode
 print >>sys.stderr, "Child was terminated by signal",
-retcode
 else:
 print >>sys.stderr, "Child returned", retcode
 except OSError, e:
 print >>sys.stderr, "Execution failed:", e
-----------------
hello world
Execution failed: [Errno 10] No child processes