question od default args

[Erik Max Francis]

"Gonçalo Rodrigues" wrote:

> When I want default args I usually do
> 
> def (arg = None):
>     ...
> 
> But what if I want to make None a reasonable argument too? That is, I
> want to know if the user has in fact passed an argument, and if not to
> do something special, with None (or whatever object) being a
> reasonable
> arg to be passed.

But then the question is, what would it makes sense for arg to have as a
value when the function is invoked without an argument?  It has to be
_something_.  If there are no "out-of-band" values that you can use to
signal "this default argument was not specified," then you're not going
to be able to distinguish the two.

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