[Tkinter] Troubles with accessing attr from other class

[zarize]

I applied what you have written, thank you.

I want to create a function which will call few functions, but i can't get through it..

    def Few_Functions(self):
        self.Load_Data() ##Located in rents.py
        self.test()    ##Located in comments.py (that's why it cannot be called with self i guess?)

It returns:

Error:
AttributeError: 'Rents_Tab' object has no attribute 'historical_entry_market'

Which is true, because Load_Data() function is located in rents.py and the button is also placed right there, but i want to call function from other file and from other class. What can be done here?

My goal is to click 1 button which will call functions from the classes