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delayed.py
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delayed.py
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#!/usr/bin/env python
# encoding: utf-8
"""
untitled.py
Created by Nathan Nichols on 2008-11-26.
Copyright (c) 2008 InfoLab. All rights reserved.
"""
class Delayed(object):
"""Will delay looking up given arguments until needed."""
def __init__(self, loader_func, args):
super(Delayed, self).__init__()
self.__loader_func = loader_func
self.__args = args
self.__lookups = {}
def __getattr__(self, arg):
if arg in self.__args:
self.__loader_func()
return getattr(self, arg)
if arg in self.__lookups:
setattr(self, arg, self.__lookups[arg]())
return getattr(self, arg)
return object.__getattribute__(self, arg)
def lookup(self, arg_name, func):
self.__lookups[arg_name] = func
class Test(Delayed):
def __init__(self):
Delayed.__init__(self, self.load, ('foo', 'bar'))
self.lookup('baz', lambda: 1000000)
def load(self):
self.foo = 42
self.bar = 'barbarbar'
def test():
c = Test()
print c.foo
print c.bar
print c.baz
if __name__ == '__main__':
test()