Почему не вызывается метод-обработчик(tkinter)(self.printer-printer)?

Question

[Loulitee]

from tkinter import *
from tkinter import ttk
import random

root = Tk()
root.geometry("400x200")

def randomNumber(max):
    return round(random.random()*max)

class CreateButton:
    def __init__(self, name, flag):
        self.button = ttk. Button(root, text=name)
        self.button.bind("Motion", self.printer)
        self.button.pack()
    def printer(self,event,flag):
        if not flag:
            self.button.place(x=randomNumber(400), y=randomNumber(200))
            print("q")
obj=CreateButton("ladno", False)
root.mainloop()