Nested if

Learn nested if blocks.

You can put another if inside an if block. This is called a nested if:

age = 25
has_id = True
if age >= 18:
    if has_id:
        print("Can enter")

Nested ifs make logic explicit but get unreadable when deep. Combining two conditions with and is usually cleaner: if age >= 18 and has_id:

Nested if vs and

The same logic can be written two ways:

# Nested if
if age >= 18:
    if has_id:
        print("OK")

# with and
if age >= 18 and has_id:
    print("OK")

The and version is shorter and more readable. Nested if is preferred only when the second condition depends on the first and other code goes between.

Assign age = 20 and has_id = True. Write if age >= 18 and has_id: print("Can enter").

Show example solution

age = 20
has_id = True
if age >= 18 and has_id:
    print("Can enter")

Combine two conditions

if age >= 18 ____ has_id:
    print("Can enter")

Show answer

if age >= 18 and has_id:
    print("Can enter")

Next lesson: Truthiness