Conditional Statements (If-Elif-Else)

Making Decisions

Programs need to react differently depending on the situation. If a user is logged in, show their profile; if not, show the login page. We handle this logic using if, elif (else-if), and else statements.

The Syntax

The code block under an if statement only runs if the condition evaluates to True.

temperature = 25

if temperature > 30:
    print("It's a hot day, stay hydrated!")
elif temperature > 20:
    print("It's a beautiful day for a walk.")
else:
    print("It's getting cold, wear a jacket.")

Remember: The indentation dictates what code belongs to which condition!

Logical Operators: Combining Conditions

What if you have multiple rules? You can chain them using and, or, and not.

• and: BOTH sides must be True.
• or: AT LEAST ONE side must be True.
• not: Flips True to False, and vice-versa.

has_ticket = True
is_vip = False

if has_ticket and not is_vip:
    print("Please wait in the standard line.")