Python Coding challenge - Day 274| What is the output of the following Python Code?

Step-by-Step Explanation:

Line 1: Dictionary Comprehension

d = {x: x**2 for x in range(3)}

This is a dictionary comprehension.

Dictionary comprehensions are a concise way to create dictionaries in Python by specifying key-value pairs inside curly braces {}.

Components of the comprehension:

for x in range(3):

range(3) generates numbers from 0 to 2 (i.e., [0, 1, 2]).

The loop will iterate over these numbers: 0, 1, and 2.

x: x**2:

This specifies the key-value pair for the dictionary.

The key is x.

The value is x**2, which means the square of x.

How the comprehension works:

It will loop through the numbers 0, 1, and 2.

For each number x, it will compute x**2 and add the key-value pair to the dictionary.

Evaluating the comprehension step-by-step:

Here’s how the comprehension expands:

For x = 0:

Key = 0, Value = 0**2 = 0

Pair added: {0: 0}

For x = 1:

Key = 1, Value = 1**2 = 1

Pair added: {0: 0, 1: 1}

For x = 2:

Key = 2, Value = 2**2 = 4

Pair added: {0: 0, 1: 1, 2: 4}

Line 2: Print the dictionary

print(d)

This prints the dictionary d, which was created using the comprehension.

Output:

{0: 0, 1: 1, 2: 4}