Python Coding challenge - Day 349| What is the output of the following Python Code?

 

Code Explanation::

import itertools  

result = itertools.combinations([1, 2, 3], 2)  

print(list(result))

import itertools:

This imports the itertools module, which provides functions that work on iterators to produce combinatorial constructs, such as permutations, combinations, and Cartesian products. The itertools module is particularly useful when you need to deal with iterators efficiently.

result = itertools.combinations([1, 2, 3], 2):

This line uses the combinations() function from the itertools module. Let's break it down:

itertools.combinations(iterable, r):

This function returns all possible combinations of length r from the input iterable (in this case, the list [1, 2, 3]). Combinations differ from permutations in that the order of the elements in each combination doesn't matter. For example, the combination (1, 2) is the same as (2, 1).

Parameters:

iterable: This is the collection from which you want to generate combinations. Here, it is the list [1, 2, 3].

r: This specifies the length of each combination. In this case, r = 2, meaning each combination should consist of 2 elements.

The itertools.combinations([1, 2, 3], 2) will generate all possible combinations of 2 elements from the list [1, 2, 3].

The combinations are:

(1, 2)

(1, 3)

(2, 3)

So, result will be an iterator that generates these combinations.

print(list(result)):

This line converts the result iterator into a list and prints the list. Since itertools.combinations returns an iterator, calling list() on it will force the iterator to generate all its items and collect them into a list.

Answer:

A: Pairs