Calling function from a class from the main code

Question

I created a code using just functions. I am now putting the functions into classes.

I created the function:

    def login()
        login_button = Button(root, text="Click here to enter data: ",
                              command=lambda: validation(username_input_box.get(), password_input_box.get()))

        login_button.place(x=210, y=240)

        quit_button = Button(root, text="Quit", command=root.quit)
        quit_button.place(x=265, y=300)

I have now put it in a class called "setup" (the class has other function):

class setup:
    def login(self):
        login_button = Button(root, text="Click here to enter data: ",
                              command=lambda: self.validation(username_input_box.get(), password_input_box.get()))

        login_button.place(x=210, y=240)

        quit_button = Button(root, text="Quit", command=root.quit)
        quit_button.place(x=265, y=300)

I want to call the function login() from outside the class. I know normally you would just do login(), but It says "login" is not defined. Any idea on how to do this?

thanks x

Why do you think it should be in a class?

Barmar
– Barmar

2021-01-19 17:51:50 +00:00
Commented Jan 19, 2021 at 17:51 — Barmar
– Barmar, Commented Jan 19, 2021 at 17:51
that's only part of the code x

Katie010203
– Katie010203

2021-01-19 18:18:49 +00:00
Commented Jan 19, 2021 at 18:18 — Katie010203
– Katie010203, Commented Jan 19, 2021 at 18:18

Sahadat Hossain · Accepted Answer · 2021-01-19 17:48:02Z

1

To access the method of a class, we need to instantiate a class into an object. Then we can access the method as an instance method of the class as shown in the program below.

class setup:
    def login(self):
        login_button = Button(root, text="Click here to enter data: ",
                              command=lambda: self.validation(username_input_box.get(), password_input_box.get()))

        login_button.place(x=210, y=240)

        quit_button = Button(root, text="Quit", command=root.quit)
        quit_button.place(x=265, y=300)

obj = setup()
obj.login()

answered Jan 19, 2021 at 17:48

Sahadat Hossain

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Kris · Accepted Answer · 2021-01-19 17:46:16Z

0

You could use a static method decorator.

For example:

class setup:
    @staticmethod
    def login():
        login_button = Button(root, text="Click here to enter data: ",
                              command=lambda: self.validation(username_input_box.get(), password_input_box.get()))

        login_button.place(x=210, y=240)

        quit_button = Button(root, text="Quit", command=root.quit)
        quit_button.place(x=265, y=300)

Note that I've removed the self parameter, since login wasn't using local variables. If it needs to, you may need to do this slightly differently.

Now you can call the function from outside the class without instantiating an object, like so:

setup.login()

answered Jan 19, 2021 at 17:46

Kris

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