Flushing stoud in Spyder

[johnhcc]

Perhaps this is not an 'issue' (maybe it's even 'desired behavior'), but then again maybe it is.

If I have a simple program

import time
print "start"
time.sleep(3)
print "done"

and run it in Spyder, I get a three second delay, and then see "start" and "done" printed virtually simultaneously.

However if I run this program in iPython directly (outside of Spyder), or using python from the command line, I see "start", a three second delay, and then "done". For me, at least, this is the desired behavior.

I'm aware I can force the issue in Spyder using import sys; sys.stdout.flush() after the print. However, without modifying my programs to insert the flush command, is there a way to get this same behavior in Spyder?

For what it's worth, calling python -u should do the same thing (but I'm not sure that helps here...)

[johnhcc]

I will add that I'm using Spyder 2.3.7 on OS X 10.10.5.

[ccordoba12]

@minrk, something about this can be done in qtconsole?

[johnhcc]

Ah, I should have tried it by opening qtconsole directly... indeed, that's where the issue is. Technically, that's just qtconsole's behavior (not necessarily a bug). Still, if there was a workaround that would benefit Spyder users, I'd love to hear about it.

[minrk]

I have a fix in mind that is rising in urgency that I'll try to get to this week or next. It should only require changes in ipykernel. There isn't a good workaround that I know of.

[ccordoba12]

@minrk, thanks a lot for letting us know about it :-)

Closing this then as it's not a Spyder bug.

[minrk]

ipython/ipykernel#85 is the PR