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Python Design Patterns - Iterator
Neha Kumawat
2 years ago
The iterator design pattern falls under the behavioral design patterns category. Developers come across the iterator pattern in almost every programming language. This pattern is used in such a way that it helps to access the elements of a collection (class) in a sequential manner without understanding the underlying layer design.
How to implement the iterator pattern?
We will now see how to implement the iterator pattern.
import time
def fib():
a, b = 0, 1
while True:
yield b
a, b = b, a + b
g = fib()
try:
for e in g:
print(e)
time.sleep(1)
except KeyboardInterrupt:
print("Calculation stopped")
Output
The above program generates the following output −
If you focus on the pattern, the Fibonacci series is printed with the iterator pattern. On forceful termination of user, the following output is printed −
Explanation
This python code follows the iterator pattern. Here, the increment operators are used to start the count. The count ends on forceful termination by the user.