AttributeError: 'NoneType' object has no attribute 'key'

[AndreiB97]

The first time EventQueue.put() is executed it throws the following exception:

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\Andrei\AppData\Local\Programs\Python\Python39\lib\threading.py", line 954, in _bootstrap_inner
    self.run()
  File "D:\OneDrive\Projects\PySync\venv\lib\site-packages\watchdog\observers\api.py", line 199, in run
    self.dispatch_events(self.event_queue, self.timeout)
  File "D:\OneDrive\Projects\PySync\venv\lib\site-packages\watchdog\observers\api.py", line 372, in dispatch_events
    handler.dispatch(event)
  File "D:\OneDrive\Projects\PySync\venv\lib\site-packages\watchdog\events.py", line 403, in dispatch
    super().dispatch(event)
  File "D:\OneDrive\Projects\PySync\venv\lib\site-packages\watchdog\events.py", line 271, in dispatch
    self.on_any_event(event)
  File "D:\OneDrive\Projects\PySync\PySync\client.py", line 25, in <lambda>
    self.handler.on_any_event = lambda event: self.queue.put(event)
  File "C:\Users\Andrei\AppData\Local\Programs\Python\Python39\lib\queue.py", line 150, in put
    self._put(item)
  File "D:\OneDrive\Projects\PySync\venv\lib\site-packages\watchdog\utils\bricks.py", line 90, in _put
    if item != self._last_item:
  File "D:\OneDrive\Projects\PySync\venv\lib\site-packages\watchdog\events.py", line 158, in __ne__
    return self.key != event.key
AttributeError: 'NoneType' object has no attribute 'key'

The problem seems to be this line: https://github.com/gorakhargosh/watchdog/blob/master/src/watchdog/utils/bricks.py#L90
In __init__ _last_item is set to None and FileSystemEvent.__ne__() uses the key property without checking the type of the other event.

This can be fixed by changing the line from:

if item != self._last_item:

to:

if self._last_item is None or item != self._last_item:

I'm currently running version 2.1.3 on Windows 10:

pip show watchdog
Name: watchdog
Version: 2.1.3
Summary: Filesystem events monitoring
Home-page: https://github.com/gorakhargosh/watchdog
Author: Yesudeep Mangalapilly
Author-email: yesudeep@gmail.com
License: Apache License 2.0
Location: c:\users\andrei\appdata\local\programs\python\python39\lib\site-packages
Requires:
Required-by:

[BoboTiG]

Closed with #818.