[Python-Dev] PEP 318 restrictions on elements (original) (raw)

[Python-Dev] PEP 318 - generality of list; restrictions on elements

Skip Montanaro skip at pobox.com
Mon Mar 8 15:27:54 EST 2004 

Fred> On Monday 08 March 2004 03:05 pm, Skip Montanaro wrote:

>> Must take a single argument, which itself must be a callable, right?

Fred> If I write:

Fred>     def foo() [w1, w2]:
Fred>         pass

Fred> I'd expect w2() to be passed whatever w1() returns, regardless of
Fred> whether it's callable.  It should raise an exception if it gets
Fred> something it can't handle.

Yes. I was thinking of the case where we wanted it to return something useful which could be bound to the name "foo". I suppose if you've had too much caffeine you could dream up a case where w1() returns an AST based on the original foo and w2() does something with it to cook up a new object, but I suspect that would be pretty rare.

Skip

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