python proxy checker ,change to threaded version

[Terry Reedy]

r0g wrote:

> The trick to threads is to create a subclass of threading.Thread, define
> the 'run' function and call the 'start()' method. I find threading quite
> generally useful so I created this simple generic function for running
> things in threads...

Great idea. Thanks for posting this.

> def run_in_thread( func, func_args=[], callback=None, callback_args=[] ):
>     import threading
>     class MyThread ( threading.Thread ):
>        def run ( self ):
> 
>             # Call function
>             if function_args:
>                 result = function(*function_args)
>             else:
>                 result = function()

The check is not necessary. by design, f(*[]) == f()
Names do not match param names ;=)

> 
>             # Call callback
>             if callback:
>                 if callback_args:
>                     callback(result, *callback_args)
>                 else:
>                     callback(result)

Ditto. g(x,*[]) == g(x)

     def run(self):
       result = func(*func_args) # matching run_in_thread param names
       callback(result, *callback_args)


>     MyThread().start()

This is one of the best uses I have seen for a nested class definition.


> Suggestions from hardcore pythonistas on how to my make run_in_thread
> function more elegant are quite welcome also :)

I shortened it, at least.

Terry Jan Reedy