Scope: Local vs Global Variables

🗂️ What is Scope?

Scope defines where a variable can be accessed and how long it exists in the program.

🔸 Types of Scope:

• Local Variable: Declared inside a function and accessible only within that function.

• Global Variable: Declared outside of all functions and accessible throughout the file.

📌 Example:

x = 10  # Global variable

def sample():
    x = 5  # Local variable
    print("Local x:", x)

sample()
print("Global x:", x)

Local x: 5
Global x: 10

✅ Modifying Global Variables

To modify a global variable inside a function, use the global keyword:

x = 10

def modify():
    global x
    x = 20  # Modifies the global 'x'

modify()
print("Modified Global x:", x)

Modified Global x: 20

💡 Why Is Scope Important?

• Prevents accidental overwriting of variables

• Keeps code modular and easier to debug

• Encourages clean and maintainable structure