On 04.11.2015 11:43, Wolfgang Maier wrote:
On 04.11.2015 11:24, Steven D'Aprano wrote:
On Wed, 4 Nov 2015 07:19 pm, Wolfgang Maier wrote:

On 04.11.2015 04:18, Steven D'Aprano wrote:

This is one of the offending line from our code base:

print('<4>Suspicious answer "{}"!'.format(answer), file=sys.stderr)

So that ought to be terminated by a newline. And yet, the stderr output
doesn't show up until the program exits.


For me, that prints immediately. Where is your output going? Console,
file, ...?

Going to stderr, like the whole thread is about :-)


I see :), but seriously, what I meant was: is it going to the console
directly or is your code base redirecting sys.stderr to another buffered
object first?


Standard I/O streams are line-buffered only if interactive (i.e., connected to a console), but block-buffered otherwise.
What does sys.stderr.isatty() return?


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