Python Coding challenge - Day 825| What is the output of the following Python Code?

Code Explantion:

1. Importing Modules

import itertools, operator

itertools: A built-in Python module providing tools for creating iterators, including combinations, permutations, etc.

operator: A module that provides function equivalents for standard operators (like +, *, etc.).

For example, operator.mul(a, b) is equivalent to a * b.

2. Creating a List of Numbers

nums = [1, 2, 3, 4]

This defines a simple list called nums containing the integers 1, 2, 3, 4.

3. Generating All 2-Element Combinations

pairs = list(itertools.combinations(nums, 2))

itertools.combinations(nums, 2) creates all possible unique pairs (without repetition) of elements from nums.

The result is an iterator, so wrapping it with list() converts it to a list.

The resulting pairs list is:

[(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)]

There are 6 pairs in total.

4. Calculating the Sum of Products of Each Pair

total = sum(operator.mul(x, y) for x, y in pairs)

This line uses a generator expression to iterate through each pair (x, y) in pairs.

For each pair:

operator.mul(x, y) multiplies the two numbers.

sum(...) adds up all these products.

Let’s compute step-by-step:

Pair Product

(1, 2) 2

(1, 3) 3

(1, 4) 4

(2, 3) 6

(2, 4) 8

(3, 4) 12

Total Sum 35

So, total = 35.

5. Dividing by Number of Pairs

print(total // len(pairs))

len(pairs) = 6 (there are 6 pairs).

total // len(pairs) uses integer division (//) to divide 35 by 6.

Calculation:

35 // 6 = 5

The program prints 5.

Final Output

5

700 Days Python Coding Challenges with Explanation