Python - Rellenar ComboBox desde MYSQL.

from tkinter import *

from tkinter import ttk

import sqlite3

import tkinter as tk

from tkinter import messagebox

import os

import configparser

import tkinter

from PIL import Image, ImageTk

from tkinter import filedialog

from PIL import ImageTk, Image

import tkinter

import mysql.connector

from mysql.connector import Error

Product = Tk()

Product.title ('App - Add Product')

Product.iconbitmap(r'./local/pics/App.ico')

Product.geometry("1000x800")

def combo_input():

    db = mysql.connector.connect(host='localhost',

                             database='test',

                             user='test',

                             password='test')

    cursor = db.execute('select nombre from test')

    result = []

    for row in cursor.fetchall():

        result.append(row[0])

    return result

combo_list = ttk.Combobox(Product)

combo_list['value'] = combo_input()

combo_list.pack()

def combo_input():

    conn = mysql.connector.connect(host = "localhost", user = "test",passwd = "test", db = "test")

    cursor = conn.cursor()

    cursor.execute("SELECT nom FROM test")

    result=cursor.fetchall()

    return result

combo_list = ttk.Combobox(Product)

combo_list['value'] = combo_input()

combo_list.pack()

from tkinter import *

from tkinter import ttk

from tkinter.ttk import Combobox

import tkinter.messagebox as mb

from tkinter import messagebox

import sqlite3

def conectarmundo():

        miConeccion=sqlite3.connect("Mundo")

        miCursor=miConeccion.cursor()

        try:

            miCursor.execute('''

                CREATE TABLE DATOSMUNDO (ID INTEGER PRIMARY KEY AUTOINCREMENT,

                                             PAIS VARCHAR(20),

                                             CONTINENTE VARCHAR(150))

                                             ''')

            messagebox.showinfo("BDD", "BDD creada con EXITO!")

        except:

            messagebox.showwarning("¡Atencion!", "La BDD yá existe")

            conexion.commit()

def coneccionpaises():

    miConeccion=sqlite3.connect("Mundo")

    miCursor=miConeccion.cursor()

    miCursor.execute("SELECT PAIS FROM DATOSMUNDO")

    result=miCursor.fetchall()

    return result

    miConeccion.commit()

root = Tk()

root.geometry("500x500")

miTipo=StringVar()

combo_list = Combobox(root, textvariable=miTipo, values=coneccionpaises()).place(x=130, y=245)

conecmontajes=Button(root, text="Conectar", command=conectarmundo, height=0, relief="raised", borderwidth=1,  bg="azure2", fg="firebrick1",

    font=("Calibri", 12, "bold")).place(x=150, y=280)

root.mainloop()