如何暂停一个函数？

代码在 jupyternotebook 里写的，奇怪的是在办公室能用，家里不能用了... 整个功能就是用 apscheduler 定时运行生成随机数然后在 tkinter 里可视化现在想保留原代码里 root.after 功能（因为直接用 root.after，按现在做法定时函数就没用了，因为 root.after 是循环的) 感觉可以用锁的方法，但是水平捉急写不出来，求指教。。

''' import datetime from apscheduler.schedulers.background import BackgroundScheduler import random import numpy as np from tkinter import * from tkinter import messagebox import matplotlib.pyplot as plt from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg import multiprocessing from threading import Thread import time

root = Tk()
root.title("tkinter + Matplotlib")
root.geometry('700x750')
plt.rcParams['axes.unicode_minus']=False
plt.rcParams['font.sans-serif'] = ['SimHei'] 
fig = plt.figure()
ax1 = fig.add_subplot(1, 1, 1)
ax2 = ax1.twinx()

ax1.set_title('随机生成数')

ax1.set_ylim()
ax2.set_ylim()

ax1.set_xlim(0, 200)
ax2.set_xlim(0, 200)

ax1.grid(True)

ax1.set_xlabel("time")
ax1.set_ylabel("随机数 1")
ax2.set_ylabel("随机数 2")

canvas = FigureCanvasTkAgg(fig, master=root)
canvas.draw()

canvas.get_tk_widget().pack()

x = 0
ran1 = []
ran2 = []
times = []

def drawImg():

    global ran1
    global ran2
    global times
    global x
    global ax1
    global ax2

    v1 = float(random.randint(-5, 5))
    r1 = float(random.randint(-10, 10))
    ran1.append(v1)
    ran2.append(r1)
    times.append(x)
    x += 1

    ax1.clear()
    ax2.clear()
    ax1.axes.set_ylim(min(ran1)-5, 5+max(ran1))
    ax2.axes.set_ylim(min(ran2)-5, 5+max(ran2))
    ax1.axes.set_xlim(x-200+200, x+20)
    ax2.axes.set_xlim(x-200+20, x+20)

    ax1.plot(times, ran1,'y')
    ax2.plot(times, ran2,'r')
    canvas.draw()
    #global afterHandler
    #afterHandler = root.after(10, drawImg)
    #print(datetime.datetime.now())

def sub_task():
    drawImg()

def task_(time):
    def task__():
        temp = BackgroundScheduler()
        temp.add_job(sub_task,'interval',seconds = 1,end_date =str(datetime.datetime.now())[:17]+time)
        temp.start()
    return task__

sche_fn = BackgroundScheduler()
sche_fn.add_job(task_('25'),'cron',day_of_week = 'mon-fri',hour = '*',minute = '*',second = '0' )
sche_fn.start()
sche_an = BackgroundScheduler()
sche_an.add_job(task_('55'),'cron',day_of_week = 'mon-fri',hour = '*',minute = '*',second = '30' )
sche_an.start()



def on_closing():
    sche_an.shutdown()
    sche_fn.shutdown()
    #root.after_cancel(afterHandler)
    answer = messagebox.askokcancel("退出", "确定退出吗?")
    if answer:
        plt.close('all')
        root.destroy()
    else:
        root.after(1000, drawImg)


root.protocol("WM_DELETE_WINDOW", on_closing)
root.mainloop()