[Python-Dev] method decorators (PEP 318) (original) (raw)

Delaney, Timothy C (Timothy) tdelaney at avaya.com
Sun Mar 28 22:33:53 EST 2004

From: Greg Ewing

Particularly considering the latter restriction, I'm wondering whether these should be treated differently in the syntax. Maybe something like def [type2trans] foo(args) [type1trans, type1trans...]: ... or def foo [type2trans] (args) [type1trans, type1trans...]: ... This might also help satisfy Guido's concerns about the positioning of 'classmethod' and 'staticmethod', since, being type 2 transformers, they would go up front.

Hmm - this seems like it has possibilities. Since we could only have one decorator that returned a descriptor, we could dispense with the [] on those, leading to:

def descriptor_trans func_name (func_args) [callable_trans, callable_trans, ...]:
    ...

e.g.

def classmethod foo (cls, arg1, arg2) [synchronized(lock)]:
    pass

which I think satisfies most the (IMO) most important requirements that various people have put forwards, namely:

  1. classmethod and staticmethod are very important and should be very obvious (Guido seems absolutely adamant on this);

  2. The name of the method should be near def;

  3. There should be nothing between the name of the function and the arguments.

Tim Delaney

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