For review: PEP 308 - If-then-else expression

[Paul Moore]

Carel Fellinger <carel.fellinger at chello.nl> writes:

> Other usage is probably like this:
>
> class MadeUp:
>    def example(self, param1=None, param2=None, param3=None, param4=None):
>        # zero is a valid value for all params
>        self.param1 = param1 == None and some-default1 or param1
>        self.param2 = param2 == None and some-default2 or param2
>        self.param3 = param3 == None and some-default3 or param3
>        self.param4 = param4 == None and some-default4 or param4

Um, why not just

    def example(self, param1=default1, param2=default2, ...)

???

If you have to calculate the default at runtime, you could do

    def example1(self, param1=None):
        self.param1 = param1
        if param1 is None: self.param1 = default1

but the full if/else statement version isn't that bad.

BTW, if you really have that many parameters all with
runtime-calculated defaults, and all optional, you should probably
consider changing your design...

It's another plausible use case, though. Just not plausible enough for
me.

Paul.
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