Python Tutorials

Python Boolean

Boolean Values

In Python, True and False represent the boolean values.

In programming code, sometimes it is necessary to determine whether an expression is True or False.

When you execute an expression with a specific condition, Python returns a boolean value, either True or False.

Example

print(2 > 3)
print(2 == 3)
print(2 < 3)

False
False
True

In the above example, the condition expressions returned True and False boolean values.

The first and second conditions check two is greater than three (2 > 3) and two is equal to three(2 == 3), respectively, and neither condition is true, so the boolean value returned is False.

In the third condition statement, we checked two is less than three (2 < 3), and the condition is satisfied, so the boolean value True returned.

Python Check Condition With if Statement

With an if statement, blocks are executed based on the returned boolean value True or False.

Example

number_a = 2
number_b = 3

if number_a > number_b:
    print("number_a is greater")
else:
    print("number_b is greater")

number_b is greater

In the above example, we are checking number two is greater than number three (2 > 3), so the output is "number_b is greater".

Analyze Values and Variables in the Boolean Constructor Function

The bool() constructor function returns True or False when you use it on any value or variable.

Example

print(bool(2))
print(bool("Hello world"))

number = 2
text = "Hello world"

print(bool(number))
print(bool(text))

True
True
True
True

Most Values are True

In Python, a value is evaluated to True if it has some sort of content.

The numeric value is True, except 0.

String text is True, except for empty strings.

A list, tuple, set, and dictionary are True, except empty ones.

Example

print(bool(10))
print(bool("Hi"))
print(bool(["Red", "Blue", "Green"]))
print(bool(("Red", "Blue", "Green")))
print(bool({"Red", "Blue", "Green"}))
print(bool({"name": "Google", "country": "USA"}))

True
True
True
True
True
True