python - Python3: Continuous variable update within Mainframe -

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basically, have created thread continuously writes global variable in infinite loop. have mainframe should read , display variable.

the problem once mainframe runs, displays value of variable read @ time of startup, , not continuously update itself. how mainframe update it's variable values specified interval?

the variable in question called "data":

notes: if run code is, "data" variable set none. adding "time.sleep(5)" before executing mainframe allow time set variable http request, , see data populated.

thanks help!

#!/library/frameworks/python.framework/versions/3.5/bin/python3 # -*- coding: utf-8 -*-  tkinter import * import time import urllib.request bs4 import beautifulsoup import threading queue import queue  data = none  class httpreq(threading.thread):     def run(self):          global data          while true:             url = "https://twitter.com/realdonaldtrump"             page = urllib.request.urlopen(url)             soup = beautifulsoup(page, "html.parser")             data = soup.title.text             print(data)  x = httpreq() x.start()  class example(frame):          global data          def __init__(self, parent):             frame.__init__(self, parent)             self.parent = parent             self.initui()          def initui(self):             self.parent.title("example app")             self.pack(fill=both, expand=true)              frame1 = frame(self)             frame1.pack(fill=x)              lbl1 = label(frame1, text="title data:", width= 20)             lbl1.pack(side=left, padx=5, pady=5)              lbl2 = label(frame1, text= data)             lbl2.pack(fill=x, padx=5, expand=true)  def main():     root = tk()     root.geometry("600x200")     app = example(root)     root.mainloop()  if __name__ == '__main__':     main()

save reference label, , set function updates label , arranges called again. in following example label updated once second.

class example(frame):     def __init__(self, parent):         ...         # call once, after ui has been initialized         self.update_data()     ...     def initui(self):         ...         # save reference label shows data         self.lbl2 = label(frame1, text= data)         self.lbl2.pack(fill=x, padx=5, expand=true)         ...      def update_data(self):         # reset label         self.lbl2.configure(text=data)          # call function again in 1 second         self.lbl2.after(1000, self.update_data)

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