[Python-ideas] Add additional special method lookups to math module

[Masklinn]

On 2011-11-09, at 22:10 , Jeremy Sanders wrote:
> Masklinn wrote:
>> That makes no sense.
> I think it does.
No, you're objecting to a local, scoped and type-based customization of operations (something already common in Python) by asking for a global functional reimplementation in user code instead.

> I could write code relying on the math.XXX failing for 
> types other than the built in numeric types, or for particular exceptions 
> for particular calls.
I fail to see how that's an argument against local customization and for global reimplementation.

> Also, if you override a standard module as a quick way 
> to get existing code working, you can get lots of existing code paths which 
> might fail in interesting ways, especially if there weren't unit tests for 
> these cases. It would make more sense if the possibility was documented in 
> the math documentation.
> 
> If you go and change the behaviour of built-in functions just by importing a 
> module it could lead to some weird bugs. I know monkey patching can do this 
> currently, but doing it by default seems dangerous to me.
Nothing in these two paragraphs makes any sense in the context of the current discussion. *Nobody* (but you) argues for "changing the behavior of built-in functions just by importing a module", or for "overriding a standard module".

I think you have misunderstood what Case Van Horsen is suggesting.