Python 3.8 Queue module is unable to handle the expection: 

error: 

Exception in thread Thread-5:
Traceback (most recent call last):
  File "FTP_multithreading.py", line 17, in run
    new_connection = self.queue.get(timeout=2)
  File "/usr/local/lib/python3.8/queue.py", line 178, in get
    raise Empty
_queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "FTP_multithreading.py", line 18, in run
    except queue.Empty:
AttributeError: 'Queue' object has no attribute 'Empty'
b'220 ns.iren.ru FTP server (Version wu-2.6.2(1) Fri Sep 12 08:50:43 IRKST 2008) ready.\r\n'
Exception in thread Thread-4:
Traceback (most recent call last):
  File "FTP_multithreading.py", line 17, in run
    new_connection = self.queue.get(timeout=2)
  File "/usr/local/lib/python3.8/queue.py", line 178, in get
    raise Empty
_queue.Empty


When the Last task is done the exception queue.Empty should occur while handling the exception another exception is occurred.

There's an error in your code:

    import queue          # loads the standard library queue module
    
    ...

    queue = queue.Queue() # reassign queue to an instance of Queue

    ...

    except queue.Empty:   # expects "queue" the module, not the instance

I still dont understand what do you mean? 

Can you please elaborate?

Raymond is talking about the cause of this error in what you showed:

AttributeError: 'Queue' object has no attribute 'Empty'

The exception you're _trying_ to catch is "queue.Empty", where "queue" is the queue _module_.  But you rebound the name "queue" to an instance of the queue.Queue class.  As the AttributeError message says, an instance of that class has no "Empty" attribute.

You need to change this line:

  queue = queue.Queue()

Pick a different name, so the _intended_ "queue.Queue" still works.

> ... so the _intended_ "queue.Queue" still works.

Oops.  Of course that should have said:

> ... so the _intended_ "queue.Empty" still works.

Thanks Tim Peters and Raymond Hettinger, the issue has been resolved.

Have a nice day!