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

[Jan Kaliszewski]

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.

Cheers.
*j