Akira Li added the comment:
It looks like the issue can be reduced to whether or not to show this
output:
>>> import os
>>> os.write(1, b'should we see this in idle?\n')
should we see this in idle?
28
assuming sys.__stdout__.fileno() == fileno(stdout) == 1.
If "should we see this in idle?" is shown in idle then the output that
writes to the inherited C stdout such as os.system('ls'),
subprocess.call('ls') will also be shown automatically.
And in reverse If "should we see this in idle?" should not be shown
then other C stdout output such as produced by os.system('ls') should
not be redirected too. The output written to the same file should be
shown/not shown consistently.
os.write(2, b'the same goes for stderr\n')
----------
nosy: +akira
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Python tracker <[email protected]>
<http://bugs.python.org/issue11820>
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