If Statement

Code Fragment can be executed only if a certain condition is met.

Syntax

if condition # Code to execute if condition is met.

condition has a boolean type (True or False).

Basic Example

if True: print("a") if False: print("b") varName = True if varName: print("c")

Output:

a c

if condition is True - execute the code inside if fragment.

Comparison Operators

Operator	Description	Examples	Result
==	Equal to	5 == 5	True
		4 == 5	False
		'4' == 4	False
!=	Not equal to	7 != 5	True
		4 != 4	False
		True != False	True
>	Greater than	5 > 0	True
		5 > 5	False
		10 > 0	True
>=	Greater than or equal to	3 >= 3	True
		5 >= 4	True
		3 >= 5	False
<	Less than	3 < 5	True
		5 < 6	True
		5 < 5	False
<=	Less than or equal to	2 <= 0	False
		5 <= 5	True
		5 < 1	False

Let's create a program that uses comparisons operators.

Determine whether person is adult (age >= 21) or child (age < 13) depending on his/her age.

age = 25 if age >= 21: print("Adult") if age < 13: print("Child")

Output:

Adult

Since age is greater than 21, line 3 executes.

Because age is not less than 13, line 6 is not executed.

Indentation

If statement, without indentation, causes error:

name = 'Clover' if name == 'Clover': print("Adult")

In order to not throw exception, it needs to be rewritten like this:

name = 'Clover' if name == 'Clover': print("Adult")