python Tkinter calling class methods from button press

Question

I am using Tkinter to create a GUI. I have a class for setting up all my GUI elements and another class that does some functionality.

class class_one():

    def method_one(self):
        do_something()

class GUI()

    def __init__(self):
        button = Button(self, text="button", command=call_class_one_method)
        button.pack()

    def call_class_one_method(self):
         c = class_one()
         c.method_one()

Is this above code the correct way for calling other class methods or should I be instantiating the class in the GUI's __init__ method? Or perhaps something else?

Answer 1

In this specific case you should instantiate it in GUI.__init__ unless there's a reason you need to create a new instance every time they click the button.

class GUI()

    def __init__(self):
        self.class_one = class_one()
        button = Button(self, text="button", command=self.class_one.method_one)
        ...

Answer 2

除非您确实需要每次按下按钮时都需要一个新的类实例（在您的示例中似乎并非如此），否则您应该在init 中实例化它。