[PYTHON MATRIX-SIG] Type coercion two more times

[David Ascher]

>       having to explain the following to potential Python array users:
>       >>> pi = omath.arctan(1.0)*4.0
>       >>> m = Array_f([1.0,2.0,3.0])
>       >>> m * pi
>       Traceback (innermost last):
> 	File "<stdin>", line 1, in ?
>       TypeError: inconsistant floating point types
> 
>    It could be made a bit easier by changing the text of the
>    error message:
>       TypeError: no automatic coercion between precisions

I have no idea whether this is possible or not, but one area where I
think Python needs help is the detail of the exceptions.  For example,
would it be possible at all to have at least the two uncoercable types
listed ("first argument is a single precision float, second argument is
a double precision float")?

--david

PS: This doesn't have to be in the next release, just something to keep
in mind.  A certain set of users at least will want to use the array
tool in an interactive context, where these things matter a lot.



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