Python Tutorial

Python HOME Python Intro Python Get Started Python Syntax Python Comments Python Variables Python Data Types Python Numbers Python Casting Python Strings Python Booleans Python Operators Python Lists Python Tuples Python Sets Python Dictionaries Python If...Else Python While Loops Python For Loops Python Functions Python Lambda Python Arrays Python Classes/Objects Python Inheritance Python Iterators Python Scope Python Modules Python Dates Python JSON Python RegEx Python PIP Python Try...Except Python User Input Python String Formatting

File Handling

Python File Handling Python Read Files Python Write/Create Files Python Delete Files

Machine Learning

Getting Started Mean Median Mode Standard Deviation Percentile Data Distribution Normal Data Distribution Scatter Plot Linear Regression Polynomial Regression Multiple Regression Scale Train/Test Decision Tree

Python MySQL

MySQL Get Started MySQL Create Database MySQL Create Table MySQL Insert MySQL Select MySQL Where MySQL Order By MySQL Delete MySQL Drop Table MySQL Update MySQL Limit MySQL Join

Python MongoDB

MongoDB Get Started MongoDB Create Database MongoDB Create Collection MongoDB Insert MongoDB Find MongoDB Query MongoDB Sort MongoDB Delete MongoDB Drop Collection MongoDB Update MongoDB Limit

Python Reference

Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords

Module Reference

Random Module Requests Module

Python How To

Remove List Duplicates Reverse a String

Python Examples

Python Examples Python Exercises Python Quiz Python Certificate

Python Booleans

Booleans represent one of two values: True or False.

Boolean Values

In programming you often need to know if an expression is True or False.

You can evaluate any expression in Python, and get one of two answers, True or False.

When you compare two values, the expression is evaluated and Python returns the Boolean answer:


print(10 > 9)
print(10 == 9)
print(10 < 9)
Run example »

When you run a condition in an if statement, Python returns True or False:


Print a message based on whether the condition is True or False:

a = 200
b = 33

if b > a:
  print("b is greater than a")
  print("b is not greater than a")
Run example »

Evaluate Values and Variables

The bool() function allows you to evaluate any value, and give you True or False in return,


Evaluate a string and a number:

Run example »


Evaluate two variables:

x = "Hello"
y = 15

Run example »

Most Values are True

Almost any value is evaluated to True if it has some sort of content.

Any string is True, except empty strings.

Any number is True, except 0.

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


The following will return True:

bool(["apple", "cherry", "banana"])
Run example »

Some Values are False

In fact, there are not many values that evaluates to False, except empty values, such as (), [], {}, "", the number 0, and the value None. And of course the value False evaluates to False.


The following will return False:

Run example »

One more value, or object in this case, evaluates to False, and that is if you have an objects that are made from a class with a __len__ function that returns 0 or False:


class myclass():
  def __len__(self):
    return 0

myobj = myclass()
Run example »

Functions can Return a Boolean

Python also has many built-in functions that returns a boolean value, like the isinstance() function, which can be used to determine if an object is of a certain data type:


Check if an object is an integer or not:

x = 200
print(isinstance(x, int))
Run example »

Test Yourself With Exercises


The statement below would print a Boolean value, which one?

print(10 > 9)

Start the Exercise