Python Coding challenge - Day 1252| What is the output of the following Python Code?

 

Code Explanation:

1️⃣ Creating the Global Variable

x = 10

Here, x is created in the global scope.

x → 10

It can be accessed from anywhere in the program unless a local variable with the same name hides it.

2️⃣ Defining the Function

def change():

This creates a function named change.

The function is only defined at this point. Its body hasn't executed yet.

3️⃣ Using global

global x

This is the key line.

It tells Python:

"Inside this function, x refers to the global variable, not a new local variable."

Without global x, the assignment in the next line would make x local to the function.

4️⃣ Updating x

x += 5

This is equivalent to:

x = x + 5

Because of global x, Python uses the global x.

So:

x = 10 + 5

  = 15

Now the global variable becomes:

x → 15

5️⃣ Calling the Function

change()

Now the function actually executes.

The flow is:

change()

   ↓

global x

   ↓

x = 10 + 5

   ↓

x = 15

6️⃣ Printing x

print(x)

The global x was changed from 10 to 15.

Therefore:

✅ Final Output

15

Book: Python Functions in Depth — Writing Clean, Reusable, and Powerful Code