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)

この issue では、リポジトリのファイルもテストも指定されていません。まず JupyterLab で別々のセルと結合したセルの例を再現し、その後、長時間実行される update_function がレンダリングに与える影響を比較します。結合したセルが要求どおりに図を更新するか、または issue に確認済みの制限とその正しい workaround が記載されていれば完了です。