How can I access objects or widgets from one class in another class?

[Konstantin23]

Here I am working with two different tkinter frame classes, in which I am trying to access the combobox widget service_list from the retrieve frame class, inside a method in the frame class menu, so that I may configure the values of the combobox.
Now my question is, how can I do so without running into a NameError or AttributeError?

import tkinter as tk from customtkinter import CTkComboBox, CTkTextbox from .backend import * class retrieve(tk.Frame): def __init__(self, parent, controller): self.controller = controller tk.Frame.__init__(self, parent, bg="black", highlightthickness=5, highlightcolor='white') self.controller = controller head = tk.Label(self, bg="black", fg="white", text="STORED DATA", font=("Terminal", 32)) services = self.controller.services data = self.controller.data data_disp = CTkTextbox(self, fg_color="black", text_color="white", font=("Terminal", 22, "bold"), scrollbar_button_color="white", scrollbar_button_hover_color="white",wrap=tk.WORD, corner_radius=0, width=450, height=250, border_width=0) def combobox_callback(choice): i = services.index(choice) result = str(data[i]) data_disp.configure(state=tk.NORMAL) data_disp.delete("0.0", tk.END) data_disp.insert("0.0", result) data_disp.configure(state=tk.DISABLED) print("combobox dropdown clicked:", choice) service_list = CTkComboBox(self, fg_color="black", text_color="white", font=("Terminal", 20, "bold"), justify="left", corner_radius=0, width=450, height=36, border_width=0, border_color="white", command=combobox_callback, dropdown_fg_color="black", dropdown_text_color="white", dropdown_font=("Terminal", 20, "bold"),hover=False, button_color="black", button_hover_color="white", dropdown_hover_color="black") service_list.set(">SERVICE NAME") back = tk.Button(self, bg="black", fg="white", text='BACK', font=("Terminal", 18, "bold"), command=lambda: controller.show_frame(page_name="menu", username=self.controller.username, services=self.controller.services, data=self.controller.data), activebackground="black", relief=tk.SOLID, borderwidth=0, padx=16, pady=0, cursor="hand2") entNote = tk.Label(self,bg="black", fg="white", text="(enter)", font=("Terminal", 10)) head.place(relx=0.5, rely=0.1, anchor=tk.CENTER) service_list.place(relx=0.1, rely=0.3, y=-10,x=-35,anchor=tk.W) data_disp.place(relx=0.1, rely=0.45, x=-30, y=65,anchor=tk.W) back.place(relx=0.5, rely=0.9, anchor=tk.CENTER) entNote.place(relx=0.5, rely=0.9, y=20, anchor=tk.CENTER) controller.exitButton(self) controller.homeButton(self) def binds(self): self.focus_set() self.controller.bind('<Return>', lambda x: self.controller.show_frame(page_name="menu", username=self.controller.username, services=self.controller.services, data=self.controller.data))

import tkinter as tk from .backend import * from .retrieve import * class menu(tk.Frame): def __init__(self, parent, controller): self.controller = controller tk.Frame.__init__(self, parent, bg="black", highlightthickness=5, highlightcolor='white') self.controller = controller head = tk.Label(self, bg="black", fg="white", text="MENU", font=("Terminal", 32)) save = tk.Button(self, bg="black", fg="white", text='STORE DATA', font=("Terminal", 20, "bold"), command=lambda: controller.show_frame(page_name="store", username=self.controller.username, services=self.controller.services, data=self.controller.data), activebackground="black", relief=tk.SOLID, borderwidth=0, padx=16, pady=7, cursor="hand2") def extract_data(): services, data = retrieve_passwords(self.controller.username) # TRYING TO ACCESS THE COMBOBOX WIDGET FROM RETRIEVE CLASS SO AS TO CONFIGURE ITS PROPERTIES retrieve1 = retrieve() retrieve1.service_list.configure(values=services) # =================================================== self.controller.show_frame(page_name="retrieve", username=self.controller.username, services=services, data=data) retrieve_but = tk.Button(self, bg="black", fg="white", text='RETRIEVE DATA', font=("Terminal", 18, "bold"), command=lambda: extract_data(), activebackground="black", relief=tk.SOLID, borderwidth=0, padx=16, pady=7, cursor="hand2") head.place(relx=0.5, rely=0.1, anchor=tk.CENTER) save.place(relx=0.5, rely=0.4, anchor=tk.CENTER) retrieve_but.place(relx=0.5, rely=0.6, anchor=tk.CENTER) controller.exitButton(self) controller.homeButton(self) def binds(self): self.focus_set()

[Gribouillis]

Instead of

service_list = …

Use

self.service_list = …

That is to say make service_list a member of the retriever object.

Avoid import * by all means. It obfuscates the code. Also try to follow PEP 8 coding style.

[Konstantin23]

Instead of

service_list = …

Use

self.service_list = …

That is to say make service_list a member of the retriever object.

Avoid import * by all means. It obfuscates the code. Also try to follow PEP 8 coding style.

Looks like it did work because no errors and I can access the object service_list. But somehow I cant seem to configure its values with the list services, everytime I click the retrieve_but in the menu frame

[Konstantin23]

Nevermind, looks like it was just a type error. Because after back testing a little bit, it seems like the method retrieve_passwords was returning a tuple instead of a list which was required to be fed into the widget values