cant quit gui window

[Priyansh2001here]

Description

What steps will reproduce the problem?

i created a tkinter gui just to exit screen and it crashes

L = Button(window, text = "to quit", command = lambda:L.quit()) L.pack()

on other ide's its working fine

Versions

• Spyder version: 4.0.0
• Python version: 3.7.4
• Qt version: 5.11.2
• PyQt5 version: 5.11.3
• Operating System: Windows 10

Dependencies

cloudpickle >=0.5.0          :  1.2.2 (OK)
pygments >=2.0               :  2.5.2 (OK)
qtconsole >=4.6.0            :  4.6.0 (OK)
nbconvert >=4.0              :  5.6.1 (OK)
sphinx >=0.6.6               :  2.3.0 (OK)
pylint >=0.25                :  2.4.4 (OK)
psutil >=0.3                 :  5.6.7 (OK)
qtawesome >=0.5.7            :  0.6.0 (OK)
qtpy >=1.5.0                 :  1.9.0 (OK)
pickleshare >=0.4            :  0.7.5 (OK)
zmq >=17                     :  18.1.0 (OK)
chardet >=2.0.0              :  3.0.4 (OK)
numpydoc >=0.6.0             :  0.9.1 (OK)
spyder_kernels >=1.8.1;<2.0.0:  1.8.1 (OK)
qdarkstyle >=2.7             :  2.7 (OK)
atomicwrites >=1.2.0         :  1.3.0 (OK)
diff_match_patch >=20181111  :  20181111 (OK)
intervaltree                 :  None (OK)
watchdog                     :  None (OK)
keyring                      :  None (OK)
pexpect >=4.4.0              :  4.7.0 (OK)
pympler                      :  None (OK)
sympy >=0.7.3                :  1.5 (OK)
cython >=0.21                :  0.29.14 (OK)
IPython >=4.0                :  7.10.2 (OK)
matplotlib >=2.0.0           :  3.1.1 (OK)
pandas >=0.13.1              :  0.25.3 (OK)
numpy >=1.7                  :  1.17.4 (OK)
scipy >=0.17.0               :  1.3.2 (OK)
pyls >=0.31.2;<0.32.0        :  0.31.2 (OK)
rtree >=0.8.3                :  0.8.3 (OK)

[ccordoba12]

L = Button(window, text = "to quit", command = lambda:L.quit()) L.pack()

You need to change your graphics backend to Tk before doing this.

For that you need to go to the menu

Tools > Preferences > IPython console > Graphics

and select Tk in the Backend entry.

[ccordoba12]

Sorry, I forgot to say that after doing that you need to restart Spyder.

[sougatar]

Changing the graphics backend to Tkinter does not solve the problem. With quit, the mainloop ends, but the GUI does not close. Need to close it manually. This is not the prescibed behavior. Works fine for other IDEs (such as sublime text)

[ccordoba12]

@sougatar, could post a simple example that generates the problem you mentioned?

Also, don't forget to post your basic Spyder info: version, installation medium (Anaconda, Conda-forge, our installers, Python.org) and operating system.

[sougatar]

Here is the example. Spyder version is 5.5.1, installation medium Anaconda, OS: Windows 10.

  import tkinter as tk
  from tkinter import *
  from tkinter import font
  from tkinter.messagebox import askokcancel

  class Quitter(Frame):
      def __init__(self, parent=None):
          Frame.__init__(self, parent)
          self.pack()

          widget = Button(self, text='Quit', command=lambda: kill(self))
          def_font = font.nametofont('TkDefaultFont')
          def_font.configure(size=12)
          widget.configure(font=def_font)
          widget.pack(side=LEFT, expand=YES, fill=BOTH)

          def kill(self):
              ans = askokcancel('Verify exit', 'Really quit?')
              if ans:
                  self.quit()

  frame = Tk()
  Quitter(frame)
  frame.mainloop()

[sougatar]

Upon reviewing other codes, it appears that IPython console is somehow interfering with tkinter quit. Any luck with this issue?