Mixing Decimal and float

[B.V.]

Hi,

In order to solve some issues due to operations between Decimal and
float, we wanted to implement a class that inherits from both float
and Decimal.

Typically, we wrote:
class Float(Decimal, float):
...

This can not be achieved because of a TypeError exception (with
message "multiple bases have instance lay-out conflict").

With a class that inherits from Decimal, with overridden __add__,
__mul__, .... , we succeed to solve operations issues.

But we also need to do:
isinstance(Float('1'), float) == True
isinstance(Float('1'), Decimal) == True
which is, AFAIK, only possible with Float(Decimal, float).

Is there a workaround ?

We are developping with python version 2.5 and 2.6.

Thanks for your help.

B.