Decorator question

[Steven W. Orr]

I just discovered decorators. Very cool. My question is that I can't
figure out how to make a decorator not be restricted to a function so it
would also work on a method.

Here's my code:

def g(expr):
def rpt(func):
def wrapper(t):
for ii in range(expr):
print ii,
func(t)
wrapper.__name_ _ = func.__name__
wrapper.__dict_ _ = func.__dict__
wrapper.__doc__ = func.__doc__
return func
return wrapper
return rpt

@g(20)
def f(s):
print 's="%s"'%s
f('Hello')

It works fine, but now I want to apply the same decorator to a class
method.

class KK:
# @g(20) This obviously doesn't work.
def f(self, s):
print 's= %s'%s

k = KK()
k.f('Hello')

Is there a trick I need?

TIA

--
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Donor?Black holes are where God divided by zero. Listen to me! We are all- 000
individuals! What if this weren't a hypothetical question?
steveo at syslang.net

[Peter Otten]

Re: Decorator question

Steven W. Orr wrote:

I just discovered decorators. Very cool. My question is that I can't
figure out how to make a decorator not be restricted to a function so it
would also work on a method.
>
Here's my code:

@g(20)
def f(s):
print 's="%s"'%s
f('Hello')

Here you are calling f() with one string argument.

It works fine, but now I want to apply the same decorator to a class
method.
>
class KK:
# @g(20) This obviously doesn't work.
def f(self, s):
print 's= %s'%s
>
k = KK()
k.f('Hello')

Here you are calling KK.f() with two arguments (an implicit KK instance and
the explicit "Hello" string).

Both calls are channeled through wrapper(t) which expects exactly one
parameter.

Is there a trick I need?

Change wrapper() to accept an arbitrary number of arguments:

def g(expr):
def rpt(func):

def wrapper(*args):

for ii in range(expr):
print ii,

func(*args)

wrapper.__name_ _ = func.__name__
wrapper.__dict_ _ = func.__dict__
wrapper.__doc__ = func.__doc__
return func
return wrapper
return rpt

Peter