What is the purpose of the iterator pattern in python

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(1) what is the iterator mode

The iterator pattern should be the easiest design pattern for programmers to understand among the 23 design patterns, because iterator patterns are often used in daily development. Take the most common loop as an example:

For (int iSize) {return false;} this.students [length] = student; length++; return true;} public int getLength () {return this.length;} @ Override public Iterator iterator () {return new ClassroomIterator (this);}}

Finally, there is the ClassroomIterator object. ClassroomIterator belongs to the concrete implementation of the iterator. Here we need to implement the hasNext method and the next method.

Public class ClassroomIterator implements Iterator {private Classroom classroom; private int index; public ClassroomIterator (Classroom classroom) {this.classroom=classroom; this.index=0;} @ Override public boolean hasNext () {if (this.index)