Python Coding challenge - Day 273| What is the output of the following Python Code?

Step-by-Step Explanation:

Line 1:

x = [1, 2, 3, 4]

A list [1, 2, 3, 4] is created and assigned to the variable x.

In Python, lists are mutable, which means their elements can be changed after creation.

Line 2:

y = x

The variable y is assigned the reference to the same list as x.

Both x and y now point to the same memory location in Python's memory.

Line 3:

y[0] = 99

This modifies the first element (index 0) of the list y. Since y is referencing the same memory location as x, this change is reflected in x as well.

So now, the list becomes [99, 2, 3, 4].

Line 4:

print(x)

The print() function outputs the current state of x.

Because y[0] = 99 also changed the first element of x, the output will show [99, 2, 3, 4].

Output:

[99, 2, 3, 4]