How do I create a python script such that it sends an email when a csv files in a directory has not updated in the last 24 hours?

I am new to python and trying to understanding how to automate stuff. I have a folder in which 5 csv files get updated daily, however sometimes one of them or two dont on particular days. Im having to manually check this folder. Instead I want to automate this in such a way that if a csv file does not update in the last 24hours, It can send an email to myself alerting me of this.

My code:

import datetime
import glob
import os
import smtplib
import string
 
now  = datetime.datetime.today() #Get current date

list_of_files = glob.glob('c:/Python/*.csv') # * means all if need specific format then *.csv
latest_file = max(list_of_files, key=os.path.getctime) #get latest file created in folder

newestFileCreationDate = datetime.datetime.utcfromtimestamp(os.path.getctime(latest_file)) # get creation datetime of last file

dif = (now - newestFileCreationDate) #calculating days between actual date and last creation date

logFile = "c:/Python/log.log" #defining a log file

def checkFolder(dif, now, logFile):
    if dif > datetime.timedelta(days = 1): #Check if difference between today and last created file is greater than 1 days
        
        HOST = "12.55.13.12" #This must be your smtp server ip
        SUBJECT = "Alert! At least 1 day wthout a new file in folder xxxxxxx"
        TO = "xx.t@gmail.com"
        FROM = "xx.t@gmail.com"
        text = "%s - The oldest file in folder it's %s old " %(now, dif) 
        BODY = string.join((
            "From: %s" % FROM,
            "To: %s" % TO,
            "Subject: %s" % SUBJECT ,
            "",
            text
            ), "\r\n")
        server = smtplib.SMTP(HOST)
        server.sendmail(FROM, [TO], BODY)
        server.quit()
        
        file = open(logFile,"a") #Open log file in append mode
 
        file.write("%s - [WARNING] The oldest file in folder it's %s old \n" %(now, dif)) #Write a log
 
        file.close() 
        
    else : # If difference between today and last creation file is less than 1 days
                
        file = open(logFile,"a")  #Open log file in append mode
 
        file.write("%s - [OK] The oldest file in folder it's %s old \n" %(now, dif)) #write a log
 
        file.close() 

checkFolder(dif,now,logFile) #Call function and pass 3 arguments defined before
 

However, this does not run without error and I just want to be notified by mail of those files in the folder that havent been updated. even if it is one of out 5 files of them or 5 out of 5 that havent updated.

from How do I create a python script such that it sends an email when a csv files in a directory has not updated in the last 24 hours?