progress bar in jupyter notebook go crazy

Question

I once tried to run the code as what in the following picture. The first time everything work right, it has only one progress bar. But when I run it again(to produce a video), the progress bar just go crazy as following, it generate many progress bars for the single task per second! How can I make it to just generate SINGLE progress bar. Thank you!

Here is what I'm facing:

Answer 1

This is related to excellent tqdm library and because all libraries use the classic tqdm instead of the notebook version.

What I do now for all notebook is to import and alias the version for notebook:

from tqdm import tqdm_notebook as tqdm

Links:

• https://pypi.org/project/tqdm/#ipython-jupyter-integration

Answer 2

This is not really an answer, but to at least avoid the crazy cell output you can use the %%capture cell magic command to suppress output for that cell. You won't see any progress, but that might be preferable to mountains of output that Jupyter fails to render as the programmer expected.

See also http://ipython.readthedocs.io/en/stable/interactive/magics.html#cellmagic-capture