Typically tkinter is used with its own main loop that takes over the main thread. You need to run your app code off its callbacks or in a different thread. But you can also call tkinter to update from your own main loop without it taking over the thread.<\/p>\n\n\n\n
import tkinter as tk\n\n#GLOBAL VARIABLES\nroot = None\nlblStatus = None\ntxtEntryBox1 = None\n\n\n######################\n##### USING THIS #####\n######################\n#\n##----- INITIALISE THE GUI -----\n#ap_gui.gui_init()\n#\n##----- UPDATE THE GUI -----\n#ap_gui.gui_update()\n#if ap_gui.has_gui_been_closed():\n# print(\"Exiting main loop\")\n# break\n#\n##----- UPDATE THE GUI STATUS TEXT -----\n#ap_gui.gui_update_status_text(\"Running task...\")\n\n\n\n#************************************************\n#************************************************\n#********** CLOSE ROOT WINDOW CALLBACK **********\n#************************************************\n#************************************************\n#User has clicked the windows close button\n#We use this so tat we can set root to None and then test that from our main app to see if we need to close the app\ndef callback():\n global root\n \n root.destroy()\n root = None\n\n\n#****************************************\n#****************************************\n#*********** BUTTON 1 CLICKED ***********\n#****************************************\n#****************************************\ndef btnButton1Clicked():\n global lblStatus\n global txtEntryBox1\n\n EnteredText = \"You entered: \" + txtEntryBox1.get()\n lblStatus.configure(text = EnteredText)\n\n\n\n#********************************\n#********************************\n#********** INITIALISE **********\n#********************************\n#********************************\ndef gui_init():\n global root\n global lblStatus\n global txtEntryBox1\n\n root = tk.Tk() #Create the root window\n \n root.protocol(\"WM_DELETE_WINDOW\", callback) #Create callback for if the window is closed\n\n root.title(\"My app\")\n root.geometry('350x200') #Set the window size width x height\n root.resizable(False, False) #Lock size\n root.minsize(350, 200) #Enforce minimum\n root.maxsize(350, 200) #Enforce maximum\n\n #Create status label\n lblStatus = tk.Label(root, text = \"Idle\")\n lblStatus.place(x=5, y=170)\n\n #Create a Entry Field\n txtEntryBox1 = tk.Entry(root, width=10)\n txtEntryBox1.place(x=5, y=5)\n\n #Create a button\n btnButton1 = tk.Button(root, text = \"Button 1\", fg = \"red\", command=btnButton1Clicked)\n btnButton1.place(x=5, y=30)\n\n\n #Execute Tkinter\n #root.mainloop() #<<<<This stalls execution of this thread here and hands it to the GUI until the window is closed\n root.update() #For this app we are calling update in our main loop instead\n \n\n\n#************************************\n#************************************\n#********** UPDATE THE GUI **********\n#************************************\n#************************************\n#This needs to be called reguarly from the main loop to keep the GUI responsive\ndef gui_update():\n global root\n \n root.update()\n \n #Note there is also this function that can be useful in some situations as its less intesive than update()\n #root.update_idletasks()\n \n \n \n#**************************************************\n#**************************************************\n#********** HAS ROOT WINDOW BEEN CLOSED? **********\n#**************************************************\n#**************************************************\n#Call this from the apps main loop to see if we need to shutdown the app\ndef has_gui_been_closed():\n if root == None:\n return True\n else:\n return False\n \n \n#********************************************\n#********************************************\n#********** UPDATE OUR STATUS TEXT **********\n#********************************************\n#********************************************\ndef gui_update_status_text(StatusText):\n global lblStatus\n \n lblStatus.configure(text = StatusText)\n gui_update()\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"Typically tkinter is used with its own main loop that takes over the main thread. You need to run your app code off its callbacks or in a different thread. But you can also call tkinter to update from your own main loop without it taking over the thread. ap_gui.py<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[371],"tags":[],"class_list":["post-4684","post","type-post","status-publish","format-standard","hentry","category-basic-setup"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/posts\/4684","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/comments?post=4684"}],"version-history":[{"count":6,"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/posts\/4684\/revisions"}],"predecessor-version":[{"id":4996,"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/posts\/4684\/revisions\/4996"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/media?parent=4684"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/categories?post=4684"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/python\/wp-json\/wp\/v2\/tags?post=4684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}