import tkinter
import gc

class Foo:

    def __init__(self):
        self.tk = tkinter.Tcl()
 #       self.tk.tk.createcommand("someCommand", self.someCommand)
        print("Foo intialized")

    def someCommand(self):
        pass

    def __del__(self):
        print("__del__ called!")

if __name__ == "__main__":

    while 1:
        f = Foo()
#        f.tk.tk.deletecommand("someCommand")
        del f
        gc.collect()