Re: [pygame] Adding __eq__ method to pygame Event class at runtime

[Nicholas Dudfield <ndudfield@xxxxxxxxx>]

Jordan Applewhite wrote:
> Hi! 
>
> I thought it would be nice to add an __eq__ method to the 
> pygame.event.Event class at runtime.  This would let me use == (rich 
> comparison operator) on events in the manner of
>
> if pygame.event.wait() == trigger_event:
>    pass
>
> I tried to do this with setattr like so (please pardon the one-liner):
> setattr( pygame.event.Event.__class__,   '__eq__',  lambda self, 
> other: self.type == other.type )
>
> I've tried several variations on this idea, but the attribute seems to 
> be off-limits.  I keep getting errors like  "TypeError: can't set 
> attributes of built-in/extension type 'builtin_function_or_method'".  
> I notice that calling pygame.event.Event.__class__ lists it as a 
> "builtin function or method.", but I'm not sure why this means I can't 
> create the method.
>
> Could someone please point me in the right direction?  Thanks, and I'm 
> sorry if this is more about python than pygame.  I'm hoping it passes 
> the relevance threshold:)
You can't monkey patch `builtins` (such as C extensions) an umbrella 
PyGame comes under. You can not monkey patch the builtin file, str or 
int types either. They are `read only`
Some wrappers (Boost ) work by creating a thicker layer; an actual 
python class which then calls the C procedures. This is more flexible in 
respect to monkey business with `C extensions`