pb.write and print don't work in jupyter notebook

[KOLANICH]

The version used is 350640d
Neither

with tqdm(...) as pb:
    pb.write("test")

nor

with tqdm(...) as pb:
     print("test")

work.
It turned out that the text output is buffered somehow, and flushed only if there are lot of lines. It is not flushed even on cell execution finish.

[casperdcl]

that's odd. if that's jupyter's decision then I'm not sure if we should try to forcefully flush...

[KOLANICH]

that's jupyter's decision then I'm not sure if we should try to forcefully flush...

I have tried, it doesn't work.

[chengs]

let me have a look.

This is because tqdm.write writes to stdout by default. And Jupyter notebook handles stdout not as same as console does. Actually, in Jupyter, tqdm_notebook.write should directly write to IPython.output. And the logic in tqdm.write does not fit Jupyter, because we don't need to clear the previous bars before writing something.

So, @casperdcl a new tqdm_notebook.write function is required to fix this issue. However, I won't have time recently. So a PR from someone else is very welcomed. If not, I will find a slot to fix it in the end of December or begining of Jan.

[KOLANICH]

BTW, in jupyterlab without widgets module installed the output works. I have not tested with widgets installed, because in jupyterlab widgets are npm module, not python one.

P.S. jupyterlab is badly designed, so I prefer to stay on jupyter notebook.

[chengs]

Closed as the problem is fixed.