capital_city.py

import sys
from tkinter import Tk, simpledialog, messagebox

def read_from_file():
    with open('worldcapital.txt','r') as file:
        for line in file:
            line = line.rstrip('\n')
            country, captial = line.split('/')
            country = country.capitalize()
            captial = captial.capitalize()
            world_capital[country] = captial

def write_to_file(country_name, capital_name):
    with open('worldcapital.txt','a') as file:
        file.write('\n')
        file.write(country_name + '/' + capital_name)
        file.close()

root = Tk()
root.withdraw()
world_capital = {}
while True:
    read_from_file()
    simpledialog.askstring
    query_country = ''
    query_country = simpledialog.askstring('Country', 'Type the name of a country: ')
    query_country = query_country.capitalize()
    if query_country in world_capital:
        result = world_capital[query_country]
        messagebox.showinfo('Answer', 'The capital city of ' + query_country + ' is ' + result + '!')
    else:
        new_capital = simpledialog.askstring('Teach me', 'I don\'t know the answer. Please teach me. What is the capital city of '+ query_country + '?')
        messagebox.showinfo('Thanks!','Thank you for teaching me. I will definitely know it next time!')
        new_capital = new_capital.capitalize()
        write_to_file(query_country,new_capital)
    answer = simpledialog.askstring('Continue','Do you want to try again? y/n: ')
    if answer == 'n':
        messagebox.showinfo('Thanks!', 'Thank you for playing!')
        root.destroy()
        sys.exit()