Python. How to implement program reuse without restart?

Question

Python

Hello, I wrote this code:

# -*- coding: utf-8 -*-
from Tkinter import *
import urllib, ttk, tkMessageBox
from threading import Thread
from Queue import Queue
queue = Queue()
def func():
    arc1 = c1.get()
    arc2 = c2.get()
    def downloader(url,file):
        urllib.urlretrieve(url, file)
        queue.put(True)

    if arc1 == 1:
        downloader('http://cs1632v4.vk.me/u222124/audios/88970df3fe1f.mp3','file1.mp3')
    if arc2 == 1:
        downloader('http://cs536301v4.vk.me/u131194151/audios/bc2867aeb217.mp3','file2.mp3')

th = Thread(target=func, args=())
def starter(event):
    th.start()
    pb.pack()
    pb.start()
root = Tk()
def task():
    try:
        q = queue.get_nowait()
    except:
        q = False
    if q:
        tkMessageBox.showinfo('Done')
    root.after(1000, task)
root.after(1000, task)
c1 = IntVar()
c2 = IntVar()
chk1 = Checkbutton(root, text = '1', onvalue = 1, offvalue = 0, variable = c1)
chk2 = Checkbutton(root, text = '2', onvalue = 1, offvalue = 0, variable = c2)
pb = ttk.Progressbar(length=200, orient='horizontal', mode='indeterminate')
but = Button(root, text = 'Go!')
root.minsize(width=400, height=350)
but.bind('<Button-1>', starter)
but.pack()
chk1.pack()
chk2.pack()
root.mainloop()

This code works, but the fact is that it is required to be able to use the program again (for example, after downloading the first file, download the second one). Now this is not possible due to the fact that streams can only be used once. How to solve this problem?

Answer 1

Look towards multiprocessing.Pool