Iterator Method: provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation.
Java offers either the "Look Before You Leap" (LBYL) philosophy or the "Easier to Ask for Forgiveness than for
Permission"(EAFP) with its iterator interface:
The former involves calling hasNext() prior to calling next() whilst the latter uses the more
recent forEachRemaining() method.
Iteration is built in to the Python object model.
Python requires only the __iter__() method to be implemented for an object to return True
to isinstance(obj, Iterable), however if an object implements just __getitem__() without __iter__ then it will
function as an iterable in Cpython!
Composite Pattern: allows you to compose objects into tree structures to represent whole-part hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.
python menus.py