即使程序在这几天之间关闭，也会在 x 天后通知

Question

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

filename = "file.pk" #filename data stored as dic = {time:[name,item]}

root = Tk()

t = IntVar()
i = StringVar()
n = StringVar()


def Notification_On_Completing(n, i, t):
    return messagebox.showinfo("Completed", "Name:- {}, Item:-{}, in Days:-{}".format(n, i, t)) 


def Check_If_Time_Is_Over():   #my actual problem is in this function 

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

    now = datetime.now()

    for i, j in dic: #trying to loop and check if the time == now() 
            if i == now: 
                Notification_On_Completing(j[0], j[1], i) #if its true return the key which is equal with its value

            elif i != now: #if now time i am tryinng to show how much time left
                print(i - now, "Time has left for name:-{}, item:-{}".format(j[0],j[1]))
            else:
                root.after(10000, Check_If_Time_Is_Over)

def SaveTheDaysToNotify():

    now = datetime.now()
    time = t.get()  # days to wait beforer notifying
    item = i.get()  #item name    
    name = i.get()  #name 

    end = now + timedelta(days=time)  #adding today with the number of days to notify

    with open(filename.pk, "rb") as f: # avoiding the overide of the files
        dic = pickle.load(f)

    dic= {end:[name, item]}  # saving a days to notify as dic which will also show the name , and item
    with open("file.pk", "wb") as f: #keeping record of the time time to notify
        pickle.dump(dic, f)
    Check_If_Time_Is_Over()


#Gui starts from here

time1 = Entry(root,textvariable=t).pack()  #taking entry as of time, name and item
name1 = Entry(root,textvariable=n).pack()

item1 = Entry(root, textvariable=i).pack()

ss = Button(root,text="done",command=SaveTheDaysToNotify).pack() #以字典格式添加到pickle数据库 dic ={time:[name, item]}

root.mainloop() Check_If_Time_Is_Over()

我正在尝试制作一个程序，它将条目作为时间，项目，名称。时间将被视为显示通知的天数。例如，程序应在 x 天后显示通知并不断检查是否x 天已经到来，即使该程序将在几天或几小时间隔内关闭并重新打开某些时间。

Answer 1

您可以将输入的日期以及数字存储在文件中。您可以使用datetime.timedelta 为您的时间添加天数。

每次你的程序运行时，你检查这个特殊文件是否存在，读取日期和数字，检查 date+number_days 是今天还是今天之前，然后创建你的通知。

如果您的程序不是 startet，它不会显示任何内容。如果您的程序没有在两者之间关闭，它不会显示任何内容 - 后一种情况可以通过一些计时器来完成，并在 TKs 主循环内定期检查（记住小时，如果更改，再次检查文件或...）

例子：

import os

from datetime import datetime , timedelta

fn = "myfile.txt"
date = None
days = None

def delDateFile():
    """Remove date file after showing notification, so next time user will
    be asked to input days again."""
    os.remove(fn)

def writeDate(d:int):
    """Adds d days to now(), writes it to file and returns the date."""
    date = datetime.now()  + timedelta(days = d)
    with open(fn,"w") as f: # overwriting existing file
        f.write(stringFromDate(date ))
    return date.date()

def dateFromString(s):
    """Parses a string into a date. Format: '%Y-%m-%d'"""
    try:
         return datetime.strptime(s,'%Y-%m-%d').date()
    except ValueError:
        print("Malformed date")
        return writeDate(-1)        

def stringFromDate(d):
    """Makes a string from a date. Format: '%Y-%m-%d'"""
    return datetime.strftime(datetime.now(),'%Y-%m-%d')


def needToShowNotification():
    def checkIfFileExistsAndExtractDate():
        """Reads a date from file, returns date from file or None if no file exists."""
        if os.path.exists(fn):
            with open(fn,"r") as f:
                date = dateFromString(f.readline())
            return date 
        return None

    def askForDaysAndWriteFile():
        """Asks for days and writes a file with the new date. Malformed input produces date of yesterday"""
        try:
            days = int(input("Days? "))
        except (ValueError, EOFError): # malformed input: empty or no number
            days = -1

        return writeDate(days) 


    # prefer date from file, else ask and write file
    date = checkIfFileExistsAndExtractDate() or askForDaysAndWriteFile()

    return date < datetime.now().date()


def Notif():
    print("------------------")
    print("-- NOTIFICATION --")
    print("------------------")
    delDateFile()

if needToShowNotification():
    Notif()
else:
    print("Go ahead, no need to notify")

输入负数运行它以查看通知（或删除创建的文件）