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

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

Ronald Oussoren oussoren at cistron.nl
Wed Mar 10 11:54:44 EST 2004

On 10-mrt-04, at 17:30, Aahz wrote:

On Wed, Mar 10, 2004, Guido van Rossum wrote:

In any case, I would prefer not to let the semantics require anything, and to make this just a (preferred) shorthand for applying arbitrary transformations to something that starts out as a function. All right, I've done my duty as the Loyal Opposition ;-), and I don't care enough to keep arguing. That still leaves the question for what is allowed within the brackets. AFAICT, the options are * A single identifier (which must be a callable)

Why not allow dotted name (foomod.modifier) as well?

* Comma-separated list of identifiers (which must be callables)

* Arbitrary expression (which must produce a sequence of callables)

This seems to allow def foo() [[x for x in sequence]]: pass which is very odd.

BTW, have we agreed on the order in which decorators will be applied? -- 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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