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Wed Jan 7 22:31:33 CET 2009 · http://mail.python.org/pipermail/python-dev/2009-January/084899.html

In the doc page for the fcntl module, the example below is given.
This seems like an error, or at least very misleading, as the normal
usage is to get the flags (F_GETFL), set or unset the bits you want to
change, then set the flags (F_SETFL).  A reader might think that the
example below merely sets O_NDELAY, but it also stomps all of the
other bits to zero.

If someone can confirm my thinking, this ought to be changed.

import struct, fcntl, os

f = open(...)
rv = fcntl.fcntl(f, fcntl.F_SETFL, os.O_NDELAY)

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[Python-Dev] error in doc for fcntl module