The folder is transferred between servers. The folder content is empty

Project background

object detection , Two box items .
By thermal imaging txt File generate heat map , Check the position of the breast and abdomen .
Only the front thermal image of the user is processed txt file .
Get... From other servers , Someone's folder , Change the folder containing the front thermal image of the user txt A document .

Problems encountered

Received folder content is empty .
In particular , There are no files in a user's folder .
Folders are transferred from other servers .

reason

May be , Content is being transferred , The folder has arrived , Think the content is empty .
Abbreviate a folder to a shell , The files under the folder are called things for short .
It's the shell ,
Things are moving ,
Then it is detected that there is nothing inside the shell ,
Think there's nothing ,
In fact, things are being transmitted .

solve

Sleep for a while , When all the documents are transferred , And do something else .

import time
time.sleep(5) #  Sleep 5 second 
#  Continue to operate 

It takes time to troubleshoot and solve problems

One morning , Add half an afternoon .
10 Point to 12 spot , Arrive at 2 p.m 4 Half past six .
in total 4 Half a dot .