Allow making python functions which would use `this` when called from js code

In js you can write something like this:

obj = {
    f: function(){
        this.do_something
    }
}
obj.f()

Suppose there is js code that you want to mix with python and which relies on this behaviour (expects to be able to call obj.f). Attempt to port obj creation to python would not work because python doesn’t have implicit this. I can see two possible solutions. First: create wrapper which would transform python function so that when it’s called from js it would receive this as first argument.

def f(self):
    self.do_something
obj = {
    'f': js_pass_this(f)
}
# or use js_pass_this as decorator

Second: create get_this() function.

def f():
    get_this().do_something
obj = {
    'f': f
}

I think first solution is both better and easier to implement though.

[caryoscelus]

Something like this seems to work:

function pass_this(f) {
    new_f = function(){
        var args = [this]
        for (var i = 0; i < arguments.length; ++i) {
            args.push(arguments[i])
        }
        f.apply(null, args)
    }
    new_f.$infos = f.$infos
    return new_f
}
pass_this.$infos = {
        __name__:"foo",
        __defaults__ : [],
        __module__ : "__main__",
        __doc__: None,
        __annotations__: {},
        __code__:{
        __class__:$B.$CodeDict,
        co_argcount:1,
        co_filename:'js',
        co_firstlineno:1,
        co_flags:67,
        co_kwonlyargcount:0,
        co_name: "pass_this",
        co_nlocals: 1,
        co_varnames: ["f"]}
}

Obviously, this isn’t proper way to introduce new brython function, but i don’t know what is for such function anyway. I presume it should be placed in javascript module, not sure what is the best name though. Any thoughts?

[PierreQuentel]

Since there was no reaction to this proposal, I remove the function this() and close this issue for the moment.