Problem with destroy in tkinter under Anaconda Spyder - anaconda

Question

In the following program, I can close the window with its close button but neither with the 'Esc' binding, nor the button callback. I am sent to the IPython console but the window stays here with a spinning wheel ! Works fine in the Terminal or with Anaconda IDLE. I am on Mac, High Sierra, Anaconda and Spyder last versions (IPython 7.1.1, Spyder 3.3.2). I suspect a problem with Spyder.
from tkinter import *
class Myapp(object):
def __init__(self):
self.root = Tk()
self.root.geometry('150x100+1+1')
self.root.title('Root')
self.root.bind('<Escape>', lambda e: self.root.destroy())
self.button = Button(self.root, text='End Program', command=self.end)
self.button.place(x=10, y=45)
self.L = [1,2,3] # result of an omitted computation
def end(self):
self.root.destroy()
app = Myapp()
app.root.mainloop()
print(app.L)
Any hint ? Thanks.

Answer 1

(Spyder maintainer here) You have two options to make your code work in Spyder:
Go to
Tools > Preferences > IPython console > Graphics
and deactivate the option called Activate support. Then after running your code, it'll block the console, but you won't have any other problems with it.
If you selected Tk as the backend in
Tools > Preferences > IPython console > Graphics
then you need to remove app.root.mainloop() from your code because using our Preferences creates a Tk event loop so your code doesn't block the console, and that makes app.root.mainloop() unnecessary.

Answer 2

Destroy doesn't work in spyder for me either, but does work fine from the system's Terminal. Carlos Cordoba's advice doesn't help.
I'm on a Mac OS Mojave, with most recent versions of Anaconda Python and Spyder available for Mojave.
I would post this as a comment, but don't have the reputation to do that.