Can you fix up wrapper function argument signatures?

[Gerard Brunick]

Consider:

>>def negate(func):

.... def wrapper(*args, **kwargs):
.... return not func(*args, **kwargs)
.... return wrapper
....

>>def f(x):

.... return x 10
....

>>g = negate(f)
>>g(20)

False

>>g(5)

True

Now g has the argument signature of (*args, **kwargs). Pop-up help in
Python
Scripter(which is great by the way) tells me this, as does

>>g.func_code.c o_varnames

('args', 'kwargs')

Is there anyway to fix this in negate? I assume that I can't just start
changing things in g.func_code since the bytecodes depend on the order
of variables and lots of other stuff that I don't claim to understand.

Please note: From the new functools module, I see that one can set/update
__module__, __name__, __doc__, and __dict__ using the corresponding
attributes
from the wrapped function; however, none these fix up the argument signature
do they? (I'm still running 2.4, so I haven't tried it.)

Thanks,
Gerard

[Diez B. Roggisch]

Re: Can you fix up wrapper function argument signatures?

Gerard Brunick schrieb:

Consider:
>

>>def negate(func):

... def wrapper(*args, **kwargs):
... return not func(*args, **kwargs)
... return wrapper
...

>>def f(x):

... return x 10
...

>>g = negate(f)
>>g(20)

False

>>g(5)

True
>
Now g has the argument signature of (*args, **kwargs). Pop-up help in
Python
Scripter(which is great by the way) tells me this, as does
>

>>g.func_code.c o_varnames

('args', 'kwargs')
>
Is there anyway to fix this in negate? I assume that I can't just start
changing things in g.func_code since the bytecodes depend on the order
of variables and lots of other stuff that I don't claim to understand.
>
Please note: From the new functools module, I see that one can set/update
__module__, __name__, __doc__, and __dict__ using the corresponding
attributes
from the wrapped function; however, none these fix up the argument
signature
do they? (I'm still running 2.4, so I haven't tried it.)

You can use Michele Simionato's decorator-module.

http://www.phyast.pitt.edu/~micheles/python/documentation.html

HTH,

Diez