Tkinter runtime error maximum recursion when open a window

Question

I actually have a big problem. I already have a tkinter window and I want to open an other.

import Tkinter
from Tkinter import *
import threading, time
from PIL import Image, ImageTk
from record_pd import *

class Gui_Record(Tkinter.Tk):

    def __init__(self, tkroot):
        self.root = Tk()
        self.root.title("Enregistreur")
        #self.root.geometry()                                                                                                                                                                                                                
        self.root.geometry("%dx%d+%d+%d" % (500, 70, 400, 300))
        self.root.c = Canvas(tkroot, bg='black')
        self.root.c.pack(fill=BOTH, expand=YES)
        self.initialize()
        self.recorder = RecordPd(tkroot)
        self.recorder.init_recorder()

    def initialize(self):
        #self.root.grid()                                                                                                                                                                                                                    

        self.root.resizable(False, False)

        self.Imgtmp = PhotoImage(file="img/record.png")
        self.imgclear = PhotoImage(file="img/clear.png")

        self.root.title = Tkinter.Label(self.root, text="Enregistreur Orgue Sensoriel", bg="black", fg="white", font=("Helvetica", 16))

        self.root.title.pack()

        self.root.button = Tkinter.Button(self, command=self.OnButtonClick, bg="black", bd=0)

        self.root.button.config(highlightthickness=0)
        self.root.button.config(activebackground="black")

        self.root.button.config(image=self.Imgtmp)
        self.root.button.pack()

        self.root.bind("<Destroy>", self._onDestroy)
        self.resume = True
        self.activate = False


    def setTkroot(self, tkroot):
        self.tkroot = tkroot

    def _onDestroy(self, e):
        self.resume = False
        self.recorder.stop_recording()


    def OnButtonClick(self):
       if (self.activate == False):
            self.resume = True
            self.recorder.open_wav()
            self.recorder.start_recording()
            thread = threading.Thread(target=self.threadClignoter)
            thread.start()
            self.activate = True
            print("In recording..")
       else:
            self.stopThread()
            self.recorder.stop_recording()
            self.activate = False

    def threadClignoter(self):
      isVisible = True

      while self.resume:
            if isVisible:
                clr = self.imgclear
            else:
                clr = self.Imgtmp

            self.root.button.config(image=clr)
            isVisible = not isVisible
            time.sleep(0.5)

    def stopThread(self):
        print("Record done.")
        self.resume = False
        self.root.button.config(image=self.Imgtmp)

When I call my object I do:

rec = Gui_Record(self.tkroot)
rec.mainloop()

When I launch a single window it's okay. But when i add my new window to my parent window it happened that:

traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1489, in __call__
    return self.func(*args)
  File "/home/naqued/Documents/assembla/backup/naqued-s-space/stido/gui_stido.py", line 139, in launch_recorder
    app = Gui_Record(self.tkroot)
  File "/home/naqued/Documents/assembla/backup/naqued-s-space/stido/record_gui.py", line 18, in __init__
    self.initialize()
  File "/home/naqued/Documents/assembla/backup/naqued-s-space/stido/record_gui.py", line 35, in initialize
    self.root.button = Tkinter.Button(self, command=self.OnButtonClick, bg="black", bd=0)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2128, in __init__
    Widget.__init__(self, master, 'button', cnf, kw)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2049, in __init__
    BaseWidget._setup(self, master, cnf)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2022, in _setup
    if not master:
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1848, in __getattr__
    return getattr(self.tk, attr
.... ... ... ... .. .. ... 
  return getattr(self.tk, attr)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1848, in __getattr__
    return getattr(self.tk, attr)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1848, in __getattr__
    return getattr(self.tk, attr)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1848, in __getattr__
    return getattr(self.tk, attr)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1848, in __getattr__
    return getattr(self.tk, attr)
RuntimeError: maximum recursion depth exceeded while calling a Python object

I don't do recursion on my code. I don't know what happened and didn't find anything in the web.

i have fix the problem, i will post my code in a few hour :) — Naqued
– Naqued, Commented May 21, 2015 at 12:37

Bryan Oakley · Accepted Answer · 2015-05-21 11:00:59Z

2

You are creating a class that inherits from Tk, but it also creates a new instance of Tk, and even though you don't show it you're also creating another root at some point (the object being passed in as tkroot) I'm not sure if that's the only problem, but it's definitely a problem.

Since this is a secondary window, you shouldn't be inheriting from Tkinter.Tk. Instead, inherit from Tkinter.Toplevel

You also have the problem that even though this creates a new window as a child of tkroot, some of the internal widgets are being created as children of tkroot so they won't appear in this window.

You also need to fix your imports -- you shouldn't be doing a global import from Tk and also importing Tk as a module.

You're likely going to have other problems. Tkinter doesn't work well with threads. I've heard that it sometimes works on linux, but in general you should never call any GUI function from any thread other than the one in which the widget was created.

edited May 21, 2015 at 11:00

answered May 21, 2015 at 10:47

Bryan Oakley

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4 Comments

Naqued Over a year ago

Thx, you'r answer is very interessting. i understand my mistake. i use now Tkinter.Toplevel, because as i read. it's the best way to create an other window. yeah i need to fix my import too. There was an other problem of recursion, because i recall mainloop() (2 mainloop() in my code) i will post my code in a few hour

Bryan Oakley Over a year ago

@Naqued: your program should only ever have a single call to mainloop

Naqued Over a year ago

Can a bad import caused a "runtime error, maximum recursion.." i actually call a object méthode, when i call it, my program have a runtime error, when i comment the call, my program work.. i'm going to learn some tips with import in python

Bryan Oakley Over a year ago

@Naqued: Can a bad import cause a maximum recursion error? Yes. When you import a module, code inside gets executed. If there's buggy code in the module you can get errors.

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