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## Overview
`Strings ` in `Python` is a sequence of characters or text that are enclosed with either a single quote (`' '`) or a double quote (`" "`).

For example, `'Theo'` is a string.  Whether the characters are enclosed in a single or double quote, it is still the same string; `'Theo'` is the same as `"Theo"`.

## How to use the not in keyword
The **`not in` statement** is used to check if a character or sequence of characters is not present in a string.

## Return value
The return value of the `not in` keyword is either `TRUE` or a `FALSE`.
## Example


# creating a string
axiom = 'Nothing worth while ever is'

# using the not in keyword
print('never' not in axiom)

## Explanation
In the code above, we check if the word `'never'` is present in a given string.
We expect it returns `True` because the word `'never'` can not be found in the string `'Nothing worth while ever is'`.

Interestingly the `not in` keyword can also be used in an `if` statement.
## Example

# creating a string
axiom = 'Nothing worth while ever is'

# using the if statement
if 'never' not in axiom:
    print("False! The word 'never' is not present.")

## Explanation 
In the code above, we use the `not in` keyword to check if the word `'never'` is not present in the string we created. And as expected, it is not.

What is the not in keyword in Python?

The "not in" keyword in Python checks if a specified character or sequence isn't in a string, returning True or False.