spawning unix command processes which run in parallel and simultaneously

Fred L. Drake, Jr. fdrake at
Mon Jun 11 17:24:53 CEST 2001

Bufu writes:
 > The documentation seems to have the wrong argument order for popen2, popen3,
 > and popen4, where the optional bufsize and more arguments are swapped
 > (should read "popen2 (cmd[, mode [, bufsize]])").
 > The documentation is in the os module under "6.1.2 File Object Creation"
 > presumably because it creates file like objects.  I would have expected it
 > to be in "6.1.5 Process Management", or at least a cross-reference there.

  Thanks for pointing this out; I've made the appropriate corrections
and additions to the Library Reference.  The updates will be part of
the manuals for Python 2.1.1 and 2.2.
  And please don't hesitate to CC: additional suggestions to be me at
python-docs at, or submit them via the Python bug tracker at


Fred L. Drake, Jr.  <fdrake at>
PythonLabs at Digital Creations

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