How do if / elif / else conditional statements work?

Conditional statements allow you to execute different blocks of code depending on a condition.

Syntax:

age = 18

if age < 13:
    print("Child")
elif age < 18:
    print("Teenager")
else:
    print("Adult")

Ternary operator:

A concise way to write a condition in a single line:

status = "adult" if age >= 18 else "minor"

Truthy and Falsy values:

In Python, the following values are considered false (Falsy):

• False, None
• 0, 0.0
• Empty collections: "", [], (), {}, set()

Everything else is considered true (Truthy):

items = []

if items:
    print("List is not empty")
else:
    print("List is empty")  # This block will execute

Chained comparisons:

Python supports chained comparisons:

x = 5
if 1 < x < 10:
    print("x is in the range from 1 to 10")