Feature Request: Allow functions as event handlers

[za3k]

To make user code potentially lighter-weight, I'd like to pass a function as an event handler.

Here's some equivalent code:

class FunctionEventHandler(watchdog.events.FileSystemEventHandler):
    def __init__(self, f):
        self.f = f
    def on_any_event(self, event):
        self.f(event)

Example usage:

observer.schedule(
    FunctionEventHandler(updates.put),
    path,
    recursive=True
)

where updates.put is here the function (updates is a python queue.Queue)

My feature request is to add this into the library, so I can instead call:

observer.schedule(updates.put, path, recursive=True)

and leave out the definition of FunctionEventHandler.