Python Booleans

In this tutorial, we will learn about Python Boolean. The Booleans data type represent one of two values: True or False.

Boolean Values

In programming, we often need to know if a condition is True or False so that we can perform action based on the results.

We can evaluate any expression to get one of two answers, True or False.

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

print(15 > 19)
print(6 == 6)
print(11 < 9)

Output

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

x = 100
y = 40

if y > x:
  print("y is greater than x")
else:
  print("y is not greater than x")

Output

Evaluate Values and Variables

The bool() function allows us to evaluate any valueto get True or False in return,

print(bool("Welcome"))
print(bool(25))

Output

Most Values are True

If any value has some sort of content, it is evaluted to True.

Any number is True, except 0.

Any string is True, except empty strings.

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

print(bool("xyz"))
print(bool(143))
print(bool(["orange", "mango", "banana"]))

Output

Some Values are False

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

Example

print(bool(()))
print(bool([]))
print(bool(False))
print(bool(None))
print(bool({}))
print(bool(0))
print(bool(""))

Output