On Tue, Nov 1, 2011 at 10:02 PM, Makoto Kuwata <k...@kuwata-lab.com> wrote:
> I tried the following code which converts instance mthods into
> static method automatically, but I don't get result what I want.
> (python 2.5.5)
>
> import sys
> from types import FunctionType
>
> class MetaClass(type):
> def __init__(cls, name, bases, dct):
> ## converts instance methods to static methods automatically
> for k in dct.keys():
> v = dct[k]
> if isinstance(v, FunctionType):
> dct[k] = staticmethod(v)
> print("*** debug: dct[%r] = %r" % (k, dct[k]))
If you want to customize the dict you need to do it in __new__, not
__init__. By the time __init__ is called, the class has already been
created.
class MetaClass(type):
def __new__(mcs, name, bases, dict):
for k, v in dict.items():
if isinstance(v, FunctionType):
dict[k] = staticmethod(v)
return type.__new__(mcs, name, bases, dict)
If you were using a more recent Python version, I would suggest using
a class decorator instead of a metaclass. You can still do this in
Python 2.5, but the syntax will be more awkward.
# Python 2.6+
def FuncGroup(class_):
for k, v in class_.__dict__.items():
if isinstance(v, FunctionType):
setattr(class_, k, staticmethod(v))
return class_
@FuncGroup
class Greeting(object):
def hello():
print("Hello!")
# Python 2.5
class Greeting(object):
def hello():
print("Hello!")
Greeting = FuncGroup(Greeting)
Cheers,
Ian
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