after在
Tk对象上使用方法：
from tkinter import *root = Tk()def task(): print("hello") root.after(2000, task) # reschedule event in 2 secondsroot.after(2000, task)root.mainloop()这是该
after方法的声明和文档：
def after(self, ms, func=None, *args): """Call function once after given time. MS specifies the time in milliseconds. FUNC gives the function which shall be called. Additional parameters are given as parameters to the function call. Return identifier to cancel scheduling with after_cancel."""
