button.on_click with parameters

In the example of “Widgets Events” of the ipywidgets doc, I knew that button.on_click can call a function without parameters. But suppose that I define a str variable a, and a function def fun(a): print(a) I would like to call this ‘fun’ function when I click the button, but I don’t know how to give the parameter a to the function fun. Thank you for your kind help!

[jtpio]

How about calling the fun function in the on_button_clicked function?

import ipywidgets as widgets
from IPython.display import display
button = widgets.Button(description="Click Me!")
display(button)

def fun(a):
    print(a)

def on_button_clicked(b):
    fun('a')

button.on_click(on_button_clicked)

[zmk5]

@rishabhmulani It would be something like this:

import functools

def on_button_clicked(b, rs_="some_default_string"):
    fun(rs_)

button.on_clicked(functools.partial(on_button_clicked, rs_="abcdefg"))