Gelonida N wrote:
> Now I wondered whether there is any way to implement a class such, that > I can write > > > for val in MyClass: > print val One way to make an object iterable (there are others) is to add an __iter__ method to the object's class. Unlike in some languages, classes in Python are themselves objects, which means that classes themselves have a class, "type". The class of a class is called the metaclass. So to make the class object (the instance) iterable, use a metaclass. >>> class MetaIter(type): ... def __iter__(self): ... for name in 'abcd': ... yield getattr(self, name) ... >>> class MyClass(object): ... __metaclass__ = MetaIter ... # In Python 3, write as class MyClass(object, metaclass=MetaIter) ... a, b, c, d, = 42, 23, -99, "Surprise!" ... >>> >>> for obj in MyClass: ... print obj ... 42 23 -99 Surprise! -- Steven -- http://mail.python.org/mailman/listinfo/python-list
