[Python] tkinter in Spyder

I am trying my first steps in tkinter. I use Spyder as IDE in Python 3.5.1, by way of Anaconda 4.0.0.

I want to run the very simple script below but it always crashes my Spyder. In a normal shell/Bash it runs though and opens the canvas.

import tkinter as tkr

tk = tkr.Tk()
canvas = tkr.Canvas(tk, width=500, height=500)
canvas.grid()
tk.mainloop()


Under Preferences for the Ipython Console I already tried different settings (i.e. Qt, Automatik, Tkinter) but none of it did help.

What am I doing wrong (and how can I do it better)?

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