Creating Custom Iterators
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Defining a Class Iterator
A custom iterator is defined using a class.
The class must follow the iterator protocol.
This class will control how iteration behaves.
Implementing Iterator Methods
To qualify as an iterator, the class must implement
__iter__() and __next__().This iterator produces values in decreasing order.
State Management
State management refers to how an iterator remembers its progress.
State is stored using instance variables.
In this example,
self.current tracks the current value.Each call to
__next__() updates the state.This mechanism allows iterators to resume exactly where they left off.