[Python-ideas] BindError as a built-in TypeError subclass (on the margin of PEP 362 discussion)

[Yury Selivanov]

On 2012-06-09, at 4:07 PM, Jan Kaliszewski wrote:
> Suggestion
> ==========
> 
> I think that BindError proposed in PEP 362 could be a built-in TypeError
> subclass, raised whenever given arguments do not match a given callable:
> 
> 1. while using Signature().bind(...) [as proposed in PEP 362],
> 
> and also
> 
> 2. while using inspect.getcallargs(...)
> 
> and *also*
> 
> 3. while doing *any* call.
> 
> Rationale
> =========
> 
> The present behaviour (ad 2. and 3.), i.e. raising TypeError, makes it
> hard to differentiate call-argument-related errors from other TypeError
> occurrences.
> 
> Raising BindError (or ArgumentError? the actual name is disputable of
> course), being a TypeError instance, instead -- would made easier
> implementing test suites, RPC mechanisms etc.

That's how it is currently implemented - BindError(TypeError).

I'll mention this in the PEP.

-
Yury