Python If...Else

Definition: An if statement runs a block of code only when a condition is True. With elif and else you can choose between several outcomes.

Example 1 — a simple if

age = 20
if age >= 18:
    print("You are an adult")

Note the colon : and the indentation — both are required.

Example 2 — if...else

else runs when the condition is False:

age = 15
if age >= 18:
    print("Adult")
else:
    print("Minor")

Example 3 — elif for multiple paths

Python checks each condition in order and runs the first True one:

score = 75
if score >= 90:
    print("Grade A")
elif score >= 70:
    print("Grade B")
elif score >= 50:
    print("Grade C")
else:
    print("Fail")

Example 4 — combining conditions

age = 25
if age > 18 and age < 65:
    print("Working age")

💡 Try this: change score in the editor and run it — watch a different branch fire each time.