display `print` in callbacks in the notebook

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
n = 0

def printer(event):
    global n
    print(f'in event {event}')
    n += 1
 

fig.canvas.mpl_connect('button_press_event', printer)

when run in IPython prints out to stdout on every mouse click. In jlab + ipympl the prints don't show up anywhere I can find...

From https://ipywidgets.readthedocs.io/en/stable/examples/Output%20Widget.html it looks like this can work via:

output = widgets.Output()
display(fig.canvas, output)

n = 0
def printer(event):
    global n
    with output:
        print(f'in event {event}')
    n += 1
    
fig.canvas.mpl_connect('button_press_event', printer)

but I suspect there is a way for this to work automatically....

The issue provides a Python callback using fig.canvas.mpl_connect and an ipywidgets.Output workaround; start by reproducing the missing print output in JupyterLab with ipympl and compare it with IPython. Done means print output from matplotlib callbacks appears automatically in the notebook without wrapping the callback in an Output context.