Python Coding Challenge - Question with Answer (ID -25626)

 

Explanation:

🔹 Line 1: Create a Tuple

x = (1, 2)

A tuple containing two elements is created.

Current value:

x = (1, 2)

Memory:

x

 │

 ▼

(1, 2)

🔹 Line 2: Add Another Tuple

x += (3,)

This looks like it is modifying the tuple.

Many people think:

(1,2)

becomes

(1,2,3)

inside the same object.

❌ That's not what happens.

🔹 What Does += Mean for Tuples?

For tuples,

+=

is equivalent to:

x = x + (3,)

Python performs tuple concatenation, not tuple modification.

🔹 Step 1: Evaluate Right Side

Python first evaluates:

x + (3,)

Current tuple:

(1, 2)

Second tuple:

(3,)

Concatenation result:

(1, 2, 3)

A new tuple is created.

🔹 Step 2: Assign Back to x

Now Python executes:

x = (1, 2, 3)

Notice:

The old tuple:

(1, 2)

is not modified.

Instead:

Old tuple remains unchanged.

A new tuple is created.

x now points to the new tuple.

🔹 Memory Before +=

x

 │

 ▼

(1, 2)

🔹 Memory After +=

Old Tuple

(1, 2)

      ✖ x no longer points here

New Tuple

(1, 2, 3)

      ▲

      │

      x

🔹 Line 3: Print the Tuple

print(x)

Current value of x:

(1, 2, 3)

Output:

(1, 2, 3)

Book: 100 Days of Math with Python