import functools
class dualmethod(object):
"""Descriptor implementing dualmethods (combination class/instance method).
Returns a method which takes either an instance or a class as the first
argument. When called on an instance, the instance is passed as the first
argument. When called as a class, the class itself is passed instead.
>>> class Example(object):
... @dualmethod
... def method(this):
... if type(this) is type:
... print "I am the class '%s'." % this.__name__
... else:
... print "I am an instance of the class '%s'." % this.__class__.__name__
...
>>> Example.method()
I am the class 'Example'.
>>> Example().method()
I am an instance of the class 'Example'.
"""
def __init__(self, func):
self.func = func
def __get__(self, obj, cls=None):
if cls is None: cls = type(obj)
if obj is None: obj = cls
@functools.wraps(self.func)
def newfunc(*args, **kwargs):
return self.func(obj, *args, **kwargs)
return newfunc
