Iterator.Iterator Uniform access to loop over an object's content. class Iterator.Iterator: def first (self): return item def next (self): return item def iterator (self): return self This class provides a uniform access to loop over an object's content in a sequential manner. It is especially used to loop over all the entries in a database (see the iterator method in the DataBase class), or all the entries matching a given criterion (see Selection class). None is returned to indicate the end of the sequence. item = iterator.first () This method returns the first item of a sequence. The kind of item depends on how the Iterator has been instanciated. item = iterator.next () Returns the next item in a sequence. The loop must have been initialized with first(). None is returned to indicate the end of the sequence. iter = iterator.iterator () This methods returns self. It is useful in order to create methods that can indifferently accept a DataBase or an Iterator as argument, as both will provide an iterator () function.