Returning same type as self for arithmetic in subclasses

[Steve Holden]

Tim Peters wrote:

> [Max M]
> 
>>"""
>>I subclass datetime and timedelta
>>
[...]
> 
> Generally speaking, no.  But I'm sure someone will torture you with a
> framework that purports to make it easy <wink>.

Clearly the easy way is to have the type declaration introspect on the 
definitions of datetime and timedelta and then auto-create methods 
wrapping the base types' methods in a "myxxx" conversion.

left-as-an-exercise-for-the-reader-ly y'rs  - steve
-- 
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