When Python looks for a variable,
it follows a fixed order called LEGB.
L → Local
E → Enclosing
G → Global
B → Built-in
Python searches in this order.
1️⃣ Local Scope (L) 📍
Variables defined inside a function.
x = 10
def func():
x = 5
print(x)
func()
Output:
5➤ Python finds
x inside the function first.2️⃣ Enclosing Scope (E) 🔄
Variables in outer function (nested functions).
def outer():
x = 20
def inner():
print(x)
inner()
outer()
Output:
20➤ Python finds
x in the enclosing function.3️⃣ Global Scope (G) 🌍
Variables defined outside all functions.
x = 30
def func():
print(x)
func()
Output:
30➤ Python uses global
x.4️⃣ Built-in Scope (B) ⚙️
Predefined names like
len, print, etc.print(len([1, 2, 3]))
Output:
3💡 Search Order
Local → Enclosing → Global → Built-in
Python stops searching once it finds the name.