python - Don't allow function to make Tk GUI hang -

so have program doing following:

1. connects mysql database , extracts table ip addresses
2. store addresses in list
3. for every ip in list, depeding on user preference, via sockets, send or receive files ip address

so, lets have send() function, starts when press button function , this:

for host in ip_list:     socket.connect((host,5005))...     socket.send(data)... 

now when server active, code works , copies fast. however, working on code polling, , when server not up, , client cannot connect, code performs rather slow, , gui hangs (example when list has 25ish ip-s function needs connect to).

so want is socket.connect((host,5005)) in thread (or not hang gui)

now, tried threading, acts strange. never works tkinter, since besides upper code lines, have tk.progressbar , few other tk things in function.

i have no idea how multiprocessing, , apparently, has no effect on io hangs.

anybody can provide me ideas?

here how tried threading:

def connect():     global host     global socket     socket.connect((host,5005))   def my_original_function():     global host     global socket     t1=threading.thread(target=connect)     host in ip_list:         t1.start()         t1.join() 

it relatively simple start more 1 thing in multiprocessing. stick in 1 class keep connected. 1 caveat create 1 tk() class instance only. more 1 causes problems. time.sleep() used in start_running function instead of after() simulate 1 thread hanging. if going use tkinter , more advanced programming, using classes simplify life imho.

from multiprocessing import process import time  try:     import tkinter tk    ## python 2.x except:     import tkinter tk    ## python 3.x  class progressbar():     def __init__(self, root):         self.root=root         self.root.geometry("75x50+900+100")         self.ctr=25      def mainloop(self):         self.root.mainloop()      def start_countdown(self):         """ separate process in separate gui         """         self.root.withdraw()         self.top_count=tk.toplevel(self.root)         self.top_count.geometry("75x50+750+50")         self.label_ctr = tk.intvar()         self.label_ctr.set(self.ctr)         label = tk.label(self.top_count, textvariable=self.label_ctr)         label.pack()         if self.ctr > 0:             self.top_count.after(750, self.update)      def start_running(self):         """ create progress bar widget         """         self.top=tk.toplevel(self.root, takefocus=true)         self.top.title("progress bar")         self.top.geometry("+700+200")         canvas = tk.canvas(self.top, width=261, height=60, bg='lightgray')         canvas.pack()          rc2 = canvas.create_rectangle(15, 20, 243, 50, outline='blue',                                       fill='lightblue')         rc1 = canvas.create_rectangle(24, 20, 34, 50, outline='white',                                       fill='blue')          total=100         x = 5         ## use after() while countdown running (self.ctr > 0)         ## avoid dangling after() when program terminates         while self.ctr:        ## move small rectangle +5 or -5 units             total += x             if total > 311:                 x = -5             elif total < 100:                 x = 5             time.sleep(0.2)             canvas.move(rc1, x, 0)             canvas.update()      def update(self):         self.ctr -= 1         self.label_ctr.set(self.ctr)          if self.ctr > 0:             self.top_count.after(750, self.update)         else:             ## sleep allow remaining after() execute             ## can use self.root.after_cancel(id)             self.top_count.after(500, self.root.destroy) ## destroy root when ctr==0  root = tk.tk()  pb=progressbar(root) pr1=process(target=pb.start_countdown(), args=()) pr1.start()  pr2=process(target=pb.start_running(), args=()) pr2.start()  ## start mainloop in separate process function of class ## don't know if necessary or not ## theory is, detached other 2 processes , ##    can react both independently ## mainloop() process can killed=shut down pr3=process(target=pb.mainloop(), args=()) pr3.start()  ## safety clean pr1.terminate() pr2.terminate() pr3.terminate()