[Python-Dev] Updated PEP 362 (Function Signature Object)

[Michael Foord]

On 6 Jun 2012, at 18:28, Yury Selivanov wrote:

> On 2012-06-06, at 1:13 PM, Alexandre Zani wrote:
>> A question regarding the name. I have often seen the following pattern
>> in decorators:
>> 
>> def decor(f):
>>   def some_func(a,b):
>>       do_stuff using f
>>   some_func.__name__ = f.__name__
>>   return some_func
>> 
>> What are the name and fully qualified names in the signature for the
>> returned function? some_func.__name__ or f.__name__?
> 
> Never copy attributes by hand, always use 'functools.wraps'.  It copies
> '__name__', '__qualname__', and bunch of other attributes to the decorator 
> object.
> 
> We'll probably extend it to copy __signature__ too; then 'signature(decor(f))'
> will be the same as 'signature(f)'.
> 


I don't think functools.wraps can copy the signature by default - it's not uncommon to have decorators that modify signatures. A new parameter to functools.wraps defaulting to False?

Michael

> -
> Yury
> _______________________________________________
> Python-Dev mailing list
> Python-Dev at python.org
> http://mail.python.org/mailman/listinfo/python-dev
> Unsubscribe: http://mail.python.org/mailman/options/python-dev/fuzzyman%40voidspace.org.uk
> 


--
http://www.voidspace.org.uk/


May you do good and not evil
May you find forgiveness for yourself and forgive others
May you share freely, never taking more than you give.
-- the sqlite blessing 
http://www.sqlite.org/different.html