[Python-Dev] Adding functools.decorator (original) (raw)
Nick Coghlan ncoghlan at iinet.net.au
Sun Apr 30 15:56:19 CEST 2006
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Collin Winters has done the work necessary to rename PEP 309's functional module to functools and posted the details to SF [1].
I'd like to take that patch, tweak it so the C module is built as _functools rather than functools, and then add a functools.py consisting of:
from _functools import * # Pick up functools.partial
def _update_wrapper(decorated, func, deco_func): # Support naive introspection decorated.module = func.module decorated.name = func.name decorated.doc = func.doc decorated.dict.update(func.dict) # Provide access to decorator and original function decorated.decorator = deco_func decorated.decorates = func
def decorator(deco_func): """Wrap a function as an introspection friendly decorator function""" def wrapper(func): decorated = deco_func(func) if decorated is func: return func _update_wrapper(decorated, func, deco_func) return decorated # Manually make this decorator introspection friendly _update_wrapper(wrapper, deco_func, decorator) return wrapper
After typing those four lines of boilerplate to support naive introspection out in full several times for contextlib related decorators, I can testify that doing it by hand gets old really fast :)
Some details that are up for discussion:
- which of a function's special attributes should be copied/updated?
- should the decorates and decorator attributes be added?
If people are happy with this idea, I can make sure it happens before alpha 3.
Cheers, Nick.
[1] http://www.python.org/sf/1478788
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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