The most idiomatic way to create a random integer in Python is the `randint()`

function of the `random`

module. Its two arguments `start`

and `end`

define the range of the generated integers. The return value is a random integer in the interval `[start, end]`

including both interval boundaries. For example, `randint(0, 9)`

returns an integer in 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

Let’s explore a couple of examples next.

## Generate a Random Integer Between 0 and 9

To create a random integer between 0 and 9, call `random.randint(0, 9)`

.

import random num = random.randint(0, 9)

The output can be any number between 0 (included) and 9 (included).

## Generate a Random Integer Between 1 and 10

To create a random integer between 1 and 10, call `random.randint(1, 10)`

.

import random num = random.randint(1, 10)

The output can be any number between 1 (included) and 10 (included).

## Generate a Random Integer Between 1 and 100

To create a random integer between 1 and 100, call `random.randint(1, 100)`

.

import random num = random.randint(1, 100)

The output can be any number between 1 (included) and 100 (included).

## Generate a Random Integer Between x and y

To create a random integer `num`

between `x`

and `y`

so that `x <= num <= y`

holds, call `random.randint(x, y)`

.

import random x, y = 0, 10 num = random.randint(x, y)

The output can be any number between `x`

(included) and `y`

(included).

## randrange()

An alternative way to create random integers within a certain range in Python is the `random.randrange()`

function. This allows you more flexibility to define the range from which the random numbers should be drawn.

Here’s the usage overview with three different sets of arguments:

Usage | Description |
---|---|

`randrange(stop)` | Return a randomly selected element from `range(0, stop, 1)` |

`randrange(start, stop)` | Return a randomly selected element from `range(start, stop, 1)` |

`randrange(start, stop, step)` | Return a randomly selected element from `range(start, stop, step)` |

Here are three example runs in my Python shell:

>>> import random >>> random.randrange(3) 1 >>> random.randrange(2, 3) 2 >>> random.randrange(2, 10, 2) 2

If you want to master the random module, check out the following video and our in-depth guide on the Finxter blog.

While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.

To help students reach higher levels of Python success, he founded the programming education website Finxter.com. He’s author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.

His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.