[Tkinter] Troubles with accessing attr from other class

[deanhystad]

You should only use Comments_Tab when creating an instance of Comments_Tab. Comments_Tab does not have any class or static resources, so everything should be called/referenced using an instance.

test_button = Button(self, text="Show Data", command=lambda: Comments_Tab.test(self))

should be

test_button = Button(self, text="Show Data", command=self.test)

def test(self):
        Comments_Tab(self).historical_entry_market.insert(0, "asd")

should be

def test(self):
        self.historical_entry_market.insert(0, "asd")

Why are you doing this

        page1 = Rents_Tab(self.notebook)
        self.notebook.add(page1, text="Rents")
        page2 = Comments_Tab(self.notebook)
        self.notebook.add(page2, text="Comments")

instead of this?

        self.notebook.add(Rents_Tab(self.notebook), text="Rents")
        self.notebook.add(Comments_Tab(self.notebook), text="Comments")

Or better yet add the pages in the tab classes:

# in main.py
        Rents_Tab(self.notebook, "Rents")
        Comments_Tab(self.notebook, "Comments")

#in comments.py
class Comments_Tab(tk.Frame):
    def __init__(self, parent, title, *args, **kwargs):
        super().__init__(parent, *args, **kwargs)
        parent.add(self, text=title)