}

def __get__(self, obj, klas):

return {'products': self.products}

class BusinessLogic(object):

""" Business logic holding data store instances """

data = Data()

| [decorator](decorator.py) | wrap functionality with other functionality in order to affect outputs |

| [facade](facade.py) | use one class as an API to a number of others |

| [factory_method](factory_method.py) | delegate a specialized function/method to create instances |

| [flyweight](flyweight.py) | transparently reuse existing instances of objects with similar/identical state |

| [graph_search](graph_search.py) | (graphing algorithms, not design patterns) |

| [lazy_evaluation](lazy_evaluation.py) | lazily-evaluated property pattern in Python |

class Adapter(object):

"""