Calling multiple functions which have multiple variables with one button. Self argument doesn't-CodePudding

I have to execute several functions with one button click. The functions have multiple variables. I think I'm pretty close to get it working but when I click the button the error TypeError: all_functions.function_1() missing 1 required positional argument: 'self' occurs.

But when I add self in this manner: all_functions.function_1(self) I reveive another error which says NameError: name 'self' is not defined. I wonder why all_functions.function_1 gets recognized perfectly fine while self does not.

import tkinter as tk

class all_functions():

    def function_1(self):
        self.a = 1
        self.b = 2
        print(self.a, self.b)

    def function_2(self):
        self.c = 3
        self.d = 4
        print(self.c, self.d)

root = tk.Tk()

create_button = tk.Button(root, command=lambda:[all_functions.function_1(), all_functions.function_2()], text="Button")

create_button.grid()

root.mainloop()

CodePudding user response：

You need to instantiate the class first:

af = all_functions() # ← Create instance, which activates self
create_button = tk.Button(root, command=lambda:[af.function_1(), af.function_2()], text="Button")

CodePudding user response：

It is because you are not instantiating an object of the class. Use

create_button = tk.Button(root, command=lambda:[all_functions().function_1(), all_functions().function_2()], text="Button")

instead of

create_button = tk.Button(root, command=lambda:[all_functions.function_1(), all_functions.function_2()], text="Button")