Need info about bind function. (multi arguments)

[BobSquarePants]

Hi everyone,

I would to use few argument with a bind function.

It seem that the lambda why generate a bug in my test.

for each in document.select('#TestDIV textarea'):
	each.bind("input", lambda ev: TheFunction(ev, what=each.name , aVariable=1000))

The error here is that all the what variable have the same output in each loop :/

So instead of a lambda is there a more classical why ?

I've tried few other but it always fail because I need to pass the ev but I don't know how to get it..

[PierreQuentel]

Hi !

This kind of issue (which is not specific to Brython) is solved by passing the loop variable to the lambda function:

from browser import document

def f(ev, what):
    print(what)
    
for each in document.select('div'):
    each.bind("click", lambda ev, each=each: f(ev, what=each.name))

[BobSquarePants]

Thank you @PierreQuentel ,

As said, is there another way (more classical) than a lambda ?

Thanks.

[PierreQuentel]

In this case, lambda is the "classical way". I borrowed the name bind from Tkinter, in which lambda is used to pass arguments to callback functions. See for instance this stackoverflow question.