Truthy vs Falsy Values

In Python, individual values can evaluate to either True or False.

The Basis rules are:

• Values that evaluate to False are considered Falsy.
• Values that evaluate to True are considered Truthy.

Falsy Values Includes:

1) Sequences and Collections:

• Empty lists []
• Empty tuples ()
• Empty dictionaries {}
• Empty sets set()
• Empty strings ” “
• Empty ranges range(0)

2) Numbers: Zero of any numeric type.

• Integer: 0
• Float: 0.0
• Complex: 0j

3) Constants:

• None
• False

Falsy values were the reason why there was no output in our initial example when the value of number was zero.

Truthy Values Includes:

• Non-empty sequences or collections (lists, tuples, strings, dictionaries, sets).
• Numeric values that are not zero.
• Constant: True

This is why the value of a printed in our initial example because its value of a number was 7(a truthy value):

In this article, we will see about the concept of Truthy and Falsy values in Python and also see how to determine a value is Truthy or Falsy by using bool() built-in Python function.

Now, Let’s start with the following two codes:

Output:

7

Let’s change value of number to 0

Output:

There is no Output

Have you wondered why the above code run successfully despite number not being an expression?

The answer lies in concept of Truthy and Falsy Values.