Python Coding Challenge - Question with Answer (ID -030626)

 

Explanation

🔹 Step 1: Create List

x = [1,2,3]

A list is created:

[1,2,3]

Length of list:

3

🔹 Step 2: Understand Walrus Operator :=

n := len(x)

This is called the Walrus Operator.

Normal way:

n = len(x)

print(n)

Walrus way:

print(n := len(x))

It does two things at the same time:

1️⃣ Assigns value

n = 3

2️⃣ Returns that value

3

🔹 Step 3: Evaluate len(x)

len(x)

Length of:

[1,2,3]

is:

3

🔹 Step 4: Execute Walrus Assignment

n := 3

Python stores:

n = 3

and returns:

3

Now memory contains:

n = 3

🔹 Step 5: Evaluate Print Arguments

First argument:

(n := len(x))

becomes:

3

Second argument:

n

already contains:

3

So Python sees:

print(3, 3)

🔹 Step 6: Print Result

print(3, 3)

Output:

3 3

Output:

3 3

Book: Mastering Pandas with Python