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@davidbgk
Forked from ianb/Lightning talk
Created April 30, 2010 07:21
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when you want to use both a classmethod and the function with a class instance
# classinstancemethod, when you want to use both a classmethod and the function with a class instance
## Descriptors
## Anything with __get__ and optionally __set__:
class classinstancemethod(object):
def __init__(self, func):
self.func = func
def __get__(self, obj, type=None):
def repl(*args, **kw):
return self.func(obj, type, *args, **kw)
return repl
## Then to use it:
class MyValidator(object):
date_format = '%Y-%m-%d'
def __init__(self, date_format=None):
if date_format is not None:
self.date_format = date_format
@classinstancemethod
def check_input(self, cls, input):
if self is None:
self = cls()
return time.strptime(input, self.date_format)
MyValidator('%m-%d-%Y').check_input('5-1-2010')
MyValidator.check_input('2010-05-01')
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