Need to create and update figures in seperate cells?

Something I've seen in previous versions as well as the current version: In order to have a figure that dynamically updates while some code is executing (e.g. tracking the loss function of an optimization), I have to create the figure in a separate jupyter notebook cell and run it before a I run the code that updates. If I don't do this, then a blank figure shows and never updates. I'm using Jupyter lab. Wondering if I'm doing something wrong here? It would make the code cleaner and easier to run if it could all be put in a single cell.

Example:

Using the following function:

def update_function(fig, ax):
   while True:
       # Do some computation
       ax.clear() #clear previously drawn
       ax.plot(some_data)
       fig.canvas.draw() #force it to update

This works:

# cell 1
fig, ax = plt.subplots()

# cell 2
update_function(fig, ax)

But this does not:

# one combined cell
fig, ax = plt.subplots()
update_function(fig, ax)

L’issue non indica alcun file o test del repository. Inizia riproducendo in JupyterLab gli esempi con celle separate e celle combinate, quindi confronta l’effetto di update_function, che ha una lunga durata, sul rendering. Il lavoro è completato quando la cella combinata aggiorna la figura come richiesto, oppure quando l’issue documenta una limitazione confermata e il relativo workaround corretto.