The LEGB rule in Python

The LEGB rule in Python defines the order in which variable names are resolved (i.e., how Python searches for a variable’s value).

🔍 LEGB Rule

L → Local

Names assigned inside a function. Python looks here first.

def func():
    x = 10  # Local
    print(x)

E → Enclosing

Names in the local scope of any enclosing functions (for nested functions).

def outer():
    x = 20  # Enclosing
    def inner():
        print(x)  # Found in enclosing scope
    inner()

G → Global

Names defined at the top-level of a script or module.

x = 30  # Global

def func():
    print(x)

func()

B → Built-in

Names preassigned in Python, like len, range, print.

print(len("CLCODING"))  # Built-in

✅ Summary of LEGB Resolution Order:

• Local
• Enclosing
• Global
• Built-in