PermissionError: [Errno 13] Permission denied based on file size - python-3.x

Question

I am trying to transfer an image file to the server
Small files(6KB, 20KB..) can be transferred successfully,
But when I try large files (at least 1MB?) I get permission denied issues in the process of opening the file.
Code to transfer files to server:
clientSock = socket(AF_INET, SOCK_STREAM)
clientSock.connect(('host', 5091))
print('checked')
# ------------------------------------------------
class Handler(FileSystemEventHandler):
def on_created(self, event):
print (f'event type : {event.event_type}\n'
f'event src_path : {event.src_path}')
file_path = event.src_path
if event.is_directory:
print ("Create directory")
else: # not event.is_directory
Fname, Extension = os.path.splitext(os.path.basename(event.src_path))
clientSock.send(b'ready')
print ("send to get ready")
def send_img(Fname, Extension):
capture_file_name = Fname+Extension
file = open(capture_file_name, "rb")
time.sleep(5)
img_size = os.path.getsize(capture_file_name)
print("img size : ")
clientSock.send(b'%d' % img_size)
print(img_size)
time.sleep(3)
img = file.read(img_size)
file.close()
clientSock.sendall(img)
filename_list = [1]
file_count = len(filename_list)
for i in filename_list:
send_img(Fname, Extension)
Error when trying to file name 4.png size 2.41MB:
Exception in thread Thread-8:
Traceback (most recent call last):
File "C:\Users\user\anaconda3\lib\threading.py", line 932, in _bootstrap_inner
self.run()
File "C:\Users\user\anaconda3\lib\site-
packages\watchdog\observers\api.py", line 203, in run
self.dispatch_events(self.event_queue, self.timeout)
File "C:\Users\user\anaconda3\lib\site-packages\watchdog\observers\api.py", line 376, in dispatch_events
handler.dispatch(event)
File "C:\Users\user\anaconda3\lib\site-packages\watchdog\events.py", line 331, in dispatch
{
File "<ipython-input-1-7e86cca481fd>", line 66, in on_created
File "<ipython-input-1-7e86cca481fd>", line 52, in send_img
PermissionError: [Errno 13] Permission denied: '4.png'
What is the cause?

Answer 1

I solved it by giving a delay before opening the file, just like I gave the delay to send the image file size to the server
like this:
def send_img(Fname, Extension):
capture_file_name = Fname+Extension
time.sleep(2)
file = open(capture_file_name, "rb")
time.sleep(5)
img_size = os.path.getsize(capture_file_name)
print("img size : ")
clientSock.send(b'%d' % img_size)