Notebook streaming output is appended when it should replace

[amunger]

Inconsistent repro, not sure what triggers it yet.

[amunger]

this is caused by the first one or two lines of output to be in one output item and the rest in another. In the case above:

"outputs": [
    {
        "name": "stdout",
        "output_type": "stream",
        "text": [
         "0\n"
        ]
    },
    {
         "name": "stdout",
         "output_type": "stream",
         "text": [
          "1\n",
          "2\n",
          "3\n",
          "4\n",
          ...

While the second output keeps streaming in, it is supposed to be replaced each time, but we were looking in the wrong element for the previous output to be replaced.

I don't know why the outputs are split like this and is the first time I've ever noticed it happening.

[DonJayamanne]

Another progress with simple ASCII output (previous sample was HTML)
(install using !pip install tqdm)

from tqdm import trange
from time import sleep

print("Hello World")
for i in trange(50):
    sleep(1)

[DonJayamanne]

Some other samples, that seems to be flaky
!pip install fastprogress

Code

from fastprogress.fastprogress import master_bar, progress_bar
from time import sleep
mb = master_bar(range(2))
for i in mb:
    for j in progress_bar(range(3), parent=mb):
        sleep(0.01)
        mb.child.comment = f'second bar stat'
    mb.main_bar.comment = f'first bar stat'
    mb.write(f'Finished loop {i}.')
    #mb.update_graph(graphs, x_bounds, y_bounds)

	# just the minimum to get the progress bars to work
from time import sleep
from fastprogress.fastprogress import master_bar, progress_bar

mb = master_bar(range(10))
progress_bar(range(100), parent=mb)

for i in mb:
    for j in progress_bar(range(100), parent=mb):
        sleep(0.01)

[amunger]

verification steps:
run the example that Don provided in a notebook cell

from tqdm import trange
from time import sleep

print("Hello World")
for i in trange(50):
    sleep(1)

only one progress bar should appear and refresh