Python Coding challenge - Day 629| What is the output of the following Python Code?

Code Explanation:

1. Importing cycle from itertools

from itertools import cycle

What it does:

This line imports the cycle function from Python's built-in itertools module.

Purpose of cycle:

cycle(iterable) returns an infinite iterator that repeatedly cycles through the elements of the iterable.

Example: cycle(["A", "B"]) will return "A", "B", "A", "B", "A", ... infinitely.

2. Defining the repeater Generator Function

def repeater():

    for val in cycle(["A", "B"]):

        yield val

What it does:

Defines a generator function named repeater.

Inside the function:

for val in cycle(["A", "B"]): Loops infinitely over the values "A" and "B".

yield val: Yields (returns) one value at a time each time the generator is called using next().

3. Creating the Generator Object

g = repeater()

What it does:

Calls the repeater function and stores the resulting generator object in variable g.

Effect:

This does not start execution immediately. It prepares the generator for iteration.

4. Using next() to Get Values from Generator

print([next(g) for _ in range(4)])

What it does:

Uses a list comprehension to call next(g) 4 times.

Each call to next(g) resumes execution of the generator and returns the next value in the cycle.

Output:

Since cycle(["A", "B"]) repeats "A", "B", "A", "B"..., the output will be:

['A', 'B', 'A', 'B']

Summary Output

['A', 'B', 'A', 'B']

 Download Book - 500 Days Python Coding Challenges with Explanation