| [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) |

| [mediator](mediator.py) | an object that knows how to connect other objects and act as a proxy |

| [memento](memento.py) | generate an opaque token that can be used to go back to a previous state |

| [mvc](mvc.py) | model<->view<->controller (non-strict relationships) |