"Philip Smith" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Call this a C++ programmers hang-up if you like.
>
> I don't seem to be able to define multiple versions of __init__ in my
> matrix
Correct.
> class (ie to initialise either from a list of values or from 2 dimensions
> (rows/columns)).
>
> Even if Python couldn't resolve the __init__ to use on the basis of
> argument types surely it could do so on the basis of argument numbers???
Variable parameter counts are handled either with default values or the
*restlist and **keydict mechanisms.
Keep in mind that the compiler cannot, in general, know, at compile time,
what function object will be bound to a name at run time. And that you can
have only bind a name to one object.
> At any rate - any suggestions how I code this????
The usual way is to write your own dispatch code to either execute the
appropriate code block or call the appropriate function.
Or you could write a function of functions that returns a function that
dispatches to one of the functions according to its arg count. Something
like (untested, all exceptions passed through):
def arg_count_dispatcher_maker(*funcs):
def arg_count_dispatcher(*args):
return funcs[len(args)](*args)
return arg_count_dispatcher
which you use like this:
__init__ = arg_count_dispatcher_maker(func0, func1, func2)
Terry J. Reedy
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