在x天内显示通知

Question

from tkinter import *
from datetime import datetime, timedelta
import time 
import pickle
from tkinter import messagebox, ttk

def done_():
    item = e1.get()
    name = e2.get()
    time = e3.get()

    now = datetime.now()
    end = now + timedelta(days=e6)

    with open(filename, "rb") as f:
        dc = pickle.load(f)

    dc[time] = [name, item]

    with open(filename, "wb") as f:
        pickle.dump(dc, f)

    e1.set("")
    e2.set("")
    e3.set("")
    check_time()


def notify_info(n, m, o)
    root.bell()
    messagebox.showinfo("Name:-{}", "Item:-{}\t, time:-{}".format(n, m, o))


def check_time():
    with open(filename, "rb") as f:
        sa = pickle.load(f)

    now = datetime.now() 
    for s, j in sa.items():
        if str(now) == s: #if time == now()
            time = str(s)
            name = sa[now][0]
            item = sa[now][1]
            return notify_info(name, item, time)

#how do i continusly check if the now() == time in dic until its true
        else:
            pass
        root.after(100, check_time)
#root.after just popped so many  windows

filename = "fuckup.pk"
def main_():

    root = Tk()
    root.title("V0.1")
    e1 = StringVar()
    e2 = StringVar()
    e3 = IntVar()
    check_time()

    lbl = Label(root).pack()
    en = Entry(root,textvariable=e1)
    en.pack()

    en1 = Entry(root, textvariable=e2)
    en1.pack()

    en2 = Entry(root, textvariable=e3)
    en2.pack()

    btn = Button(root,text="click",command=done_)
    btn.pack()
    root.after(10, check_time)

    root.mainloop()

if __name__ == "__main__":
    main_()

我正在尝试创建一个程序，它将输入名称，项目和时间。我希望程序将详细信息保存到pickle文件并检查现在是否是时间并显示名称和项目的通知。但是我无法弄清楚如何检查时间是否到来。如果now（）是时间，我很难检查每一秒。