Passing Parameters onto objects using self

Question

I am trying to use multiple buttons that all call the same function but have different parameters of 1, 2, 3, and so on. I want to have these parameters pass through the function in the class and only affect the object whose name matches that parameter. My issue is that I do not know how to use parameters with objects using self. I am new to programming and tkinter so any help, tips, or criticism is appreciated. If I messed up anything in my explanation please also let me know, thanks.

class Main(tk.Tk):
    def __init__(self):
        super().__init__()
        self.sub_app1= None
        self.sub_app2= None
        self.sub_app3= None
        b1 = tk.Button(self, text="Open Sub App One", command= lambda: self.sub_app_open(1))
        b1.pack(padx=20, pady=20)

    def sub_app_open(self, app):
        #self.sub_app = ("sub_app" + str(app))
        if self.sub_app(1) is None:
            print(type(self.sub_app1))
            self.sub_app = window1(self)

I will add more buttons calling that same function with a parameter that correlated to self.sub_app1, 2, and 3. I already tried doing sub_app + str(app) but my little knowledge of types let me down.

Answer 1

The line if self.sub_app(1) is None: causes trouble here. The object self.sub_app does not exist in the first place, which is why you're getting error messages here. Trying to define it, as you did in the commented out line self.sub_app = ("sub_app" + str(app)) creates a string, but a string is not the same thing as a function. If you are continuing on this path, you need to "translate" the function name/string into a callable object. Assuming, the functions sub_app1, ... exist in the body of your class, you could do so with the vars function:

sub_app_name = "sub_app" + str(app)
func = vars(self)[sub_app_name]
func(self)

But this seems a bit convoluted. Is there a reason why you can't directly go command = self.sub_app1?