Python如何将Tkinter文本框输入值作为countdown函数参数传入？

• 触发countdown函数时未传递自定义时长参数，程序始终使用默认值10运行
• 原有读取用户输入时长的逻辑被注释，且原位置不合理：如果在递归函数内每次执行都读取输入框值，会覆盖倒计时的递减逻辑，仅需在首次触发倒计时的时候读取一次用户输入即可

调整countdown函数的参数逻辑，首次调用无参数传入时，自动读取输入框的时长转换为秒作为初始倒计时值，递归调用时传递递减后的数值即可，同时修正回车绑定逻辑避免直接触发通知。

import time
from tkinter import *
from plyer import notification
from tkinter import messagebox

def space():
    space = Label(text="", bg="darkgreen")
    space.grid()

def countdown(count=None):
    # 首次调用时读取用户输入的时长
    if count is None:
        if task_box.get() == "" or time_box.get() == "" or not time_box.get().isdigit():
            messagebox.showwarning(title="Error", message="Please set task and / or time")
            return
        # 分钟转秒
        count = 60 * int(time_box.get())
    count_label["text"] = count
    if count > 0:
        root.after(1000, countdown, count-1)
    if count == 0:
        set_notifier()


def set_notifier():
    notification.notify(
        title = f"{task_box.get()}",
        message = "Don't be stupid, just do what I say!",
        timeout=3
    )


root = Tk()
# root.iconbitmap("yt.ico")
root.title("Notifier")
root.geometry("400x400")
root.columnconfigure(0, weight=1)
root.config(bg="darkgreen")

space()
space()
space()

task_label = Label(root, text="Enter task", bg="darkgreen", fg="white", font=("jost", 9, "bold"))
task_label.grid()

EntryVar = StringVar()
task_box = Entry(root, width=27, textvariable=EntryVar)
task_box.grid()

space()

time_label = Label(root, text="Set time (minutes)", bg="darkgreen", fg="white", font=("jost", 9, "bold"))
time_label.grid()

EntryVar = StringVar()
time_box = Entry(root, width=27, textvariable=EntryVar)
time_box.grid()

space()
space()

set_btn = Button(width=23, height=1, bg="darkgreen", fg="white", text="Set", font=("jost", 11, "bold"), command=countdown)
set_btn.grid()

space()

count_label = Label(root, text="", bg="darkgreen", fg="white")
count_label.grid()

space()
space()

# 修正回车绑定逻辑，触发倒计时而非直接发通知
root.bind('<Return>', lambda e: countdown())
root.mainloop()

内容的提问来源于stack exchange，提问作者Katkoota