1必需的位置参数？

Question

当我运行这段代码时，给了我一个TypeError: countdown() missing 1 required positional argument: 'time_left'时间，因为我用参数5调用函数，所以剩余时间应该是5

import tkinter

window = tkinter.Tk()
window.geometry('600x500')

lblCrono = tkinter.Label(window, text = '', bg = 'white', fg = 'red', font = 'Comic 20', padx = 50, pady = 5)
lblCrono.grid(column = 1, row = 5, sticky = tkinter.S, padx = 100, pady = 150)

def countdown (time_left):

    while time_left >= 0:
        lblCrono.configure(text = str(time_left))
        time_left = time_left - 1
        window.after(1000, countdown)

countdown(5)

window.mainloop()

Answer 1

countdown()内的while循环应替换为if语句，并且time_left也应传递给after(...)：

def countdown(time_left):
    lblCrono.configure(text=str(time_left))
    if time_left > 0:
        time_left -= 1
        window.after(1000, countdown, time_left)