[Python-Dev] Making popen2 actually work
Eric S. Raymond
Tue, 14 Nov 2000 11:59:24 -0500
OK, so Guido told me at one point that 2.0 was supposed to have
included changes to the way buffering of I/O to subprocesses is
handled. I've installed 2.0, and I need to know how to make the
following program work:
import os, sys
(child_stdin, child_stdout) = os.popen2("/usr/bin/rev", "t", 1);
print "* Child process spawned"
line = raw_input(">");
print "* Line written to child process"
transformed = child_stdout.readline(); child_stdout.flush()
print "* Line read back from child process."
If anybody can tell me what the right magic is here, I'll write up
a patch for the library docs explaining it and including the corrected
example. This has to be a FAQ.