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printing far later than the actual print statement

asked 2018-12-10 08:50:23 -0500

Artuur gravatar image

I have some code in a jupyter notebook which takes some time to run. When I run it, it does multiple calculations in which between there are print statements such that I can see certain results. Now the thing is that it sometimes chooses to wait with revealing the results of print statements. With this I mean:
My code first prints some results, then 20 seconds later it prints a lot more result. But I added the current time to all my print statements, which reveals that most of them could have been shown less than a second after the first results were printed. This makes sense since it finishes off with calculating a groebner basis, which takes longer than any of the other calculations, but I don't know why it wouldn't show any of the print statements which are done before the groebner basis calculations start.
Is there a way to make certain that it immediately prints instead of waiting until a later step of the program?

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answered 2018-12-11 03:08:19 -0500

slelievre gravatar image

For efficiency, print instructions send output to a buffer, and the printing can happen later.

To force printing immediately, try flushing the output.

See https://duckduckgo.com/?q=python+flush.

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Asked: 2018-12-10 08:50:23 -0500

Seen: 38 times

Last updated: Dec 11 '18