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

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

Aahz aahz at pythoncraft.com
Mon Mar 8 15:32:13 EST 2004

On Mon, Mar 08, 2004, Fred L. Drake, Jr. wrote:

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

Must take a single argument, which itself must be a callable, right? If I write: def foo() [w1, w2]: pass I'd expect w2() to be passed whatever w1() returns, regardless of whether it's callable. It should raise an exception if it gets something it can't handle.

No, that's not right. If

def foo() [w1, w2]: pass

is valid, this must also always be valid:

def foo() [w2]: pass

I'm not sure to what extent we can/should enforce this, but I'm -1 on any proposal for which this isn't the documented behavior.

Aahz (aahz at pythoncraft.com) <*> http://www.pythoncraft.com/

"Do not taunt happy fun for loops. Do not change lists you are looping over." --Remco Gerlich, comp.lang.python

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