Thanks for the help!
Last question, I can open up a new thread if needed but I’m trying to remove the periodic call back. I did some searching and found your post a little while back on removing callbacks from a document.
Here’s my new test code using that source as a baseline to remove a callback as soon as the generator is exhausted:
from random import randint
from collections import Counter
from bokeh.layouts import column
from bokeh.models import Button, ColumnDataSource, FactorRange
from bokeh.driving import count
from bokeh.plotting import figure, curdoc
# create a plot and style its properties
p = figure()
ds = ColumnDataSource(data=dict(count=[], l4=[]))
# add a text renderer to our plot (no data yet)
r = p.circle(x='count', y='l4', source=ds)
i = 0
data_amount = 250
L4_test = (randint(9232, 9235) for _ in range(data_amount))
# create a callback that will get "l4" data for the next count
def button_callback():
curdoc().add_periodic_callback(update, 20)
def update():
global i
global data_amount
if i == data_amount:
curdoc().remove_periodic_callback(update)
return
new_data = stream_l4_data()
ds.stream(new_data)
i = i + 1
def stream_l4_data() -> dict:
global i
return dict(count=[i + 1], l4=[next(L4_test)])
# add a button widget and configure with the call back
button = Button(label="Start")
button.on_click(button_callback)
# put the button and plot in a layout and add to the document
curdoc().add_root(column(button, p))
When I run this snippet using bokeh serve test.py it runs as expected until the generator exhausts. When the generator exhausts the remove_periodic_callback(update) function runs, but now my terminal shows ValueError: callback already ran or was already removed, cannot be removed again. How is the update function still running in the event loop when I specifically turned it off?