Python Tutorial



Python Tutorial

Random Number in Python

Random numbers in Python play a fundamental role in various programming applications, from gaming simulations to cryptography. Python has a handy 'random' module that provides developers with useful tools for creating random numbers easily. These tools use a special kind of number generator that seems random and can make both whole numbers and decimal numbers.

For instance, the 'random()' function in Python makes random decimal numbers between 0.0 and 1.0. On the other hand, 'randint()' can create random whole numbers in a given range.

 'Choice()' selects random elements from sequences, and 'sample()' provides lists of unique random selections. Furthermore, Python enables control over random number generation by setting seed values for reproducibility. 

The ability to shuffle lists and generate uniform Random numbers in Python adds to the module's utility. This comprehensive toolkit empowers Python programmers to harness randomness effectively, catering to the diverse needs of applications ranging from gaming to scientific research. In this discussion, we will explore these functions, demonstrating how Python makes integrating randomness into software development effortless.


The 'random' module offers a robust suite of functions to generate Random numbers in Python, catering to various programming needs. These functions offer various abilities, starting from simple tasks like creating random numbers to more advanced options such as mixing and controlling outcomes using seeds.

The 'random()' function creates decimal numbers between 0.0 and 1.0. Meanwhile, 'randint()' produces random whole numbers within specific ranges. 'Choice()' and 'sample()' facilitate random selection from sequences, ensuring diversity and uniqueness. Moreover, Python allows the setting of seed values for consistent random sequences. 

With 'shuffle(),' lists can be randomly reordered. Python's versatility in random number generation empowers developers to create dynamic and unpredictable elements in their applications, enhancing gaming experiences, statistical simulations, and more.

Certainly, here's a more presentable format with opening lines for explaining different ways to generate random numbers in Python:

Different Ways to Generate Random Numbers in Python

Random number generation is fundamental in many programming applications, from gaming to simulations and data analysis. Python offers multiple techniques for creating random numbers using the random module.

Now, let's explore the different methods you can use to produce random numbers in Python. For instance, consider a random in Python example where you need to generate random integers within a specific range.

  1. Using the random() Function

The random() function generates a random decimal number between 0.0 and 1.0. Think of it as the fundamental tool for creating various other random numbers.

  1. Using the choice() Function

The choice() function selects a random item from a list, tuple, or string, making it useful for picking random elements from collections.

  1. Using the randrange() Function

randrange() generates a Python random integer within a specified range, allowing you to include a step size for more control.

  1. Using the seed() Function

The seed() function allows you to save the state of the random number generator, enabling reproducible results.

  1. Using the shuffle() Function

With shuffle(), you can randomly reorder elements within a list, which can be especially useful for shuffling sequences like decks of cards.

  1. Using the Python random uniform() Function

The uniform() function generates random in Python floating-point numbers within a specified range, offering flexibility for various applications.

These methods offer flexibility for generating random numbers in Python, suitable for various applications such as gaming, simulations, and data analysis.

Generating a Random Number Using Choice() 

In Python, random numbers can be generated using methods from the random module. One of these methods is choice(), which selects a random item from a list, tuple, or string. I'll explain how to use random.choice() with examples.



In this instance, we bring in the random module and create a list named list1 with numbers in it. Afterward, we employ the random.choice() function to pick a random item from the list and keep it in the variable random_value. Lastly, we display the value that was randomly selected. The random.choice() function is flexible and can be applied to choose random elements from not only lists but also strings or tuples.

This approach offers an easy method to create random values from a provided collection in Python.

Generating a Random Number Using randrange()

The Python function random.randrange() is a handy tool for creating random numbers in a specific range. If necessary, you can even specify a step size. Let me demonstrate how it functions:

Here's a practical example of its usage:


A random number from the range is: 41

In this scenario, we employed the Python random module and the random.randrange() function to create a random number. This number ranges from 20 to 50, encompassing both 20 and 50, and increments by 3 with each iteration. The random.randrange() function selects a number within this range, with the spacing between them determined by the step size.

Let's break down some important things to remember about random.randrange():

  • It starts at the number you specify as the first value (in this instance, 20). It doesn't go past the number you set as the second value (which is 50 in this scenario).

  • So, it covers everything from 20 up to but not including 50.

  • The step size (3 in this example) determines the interval between possible random values. It skips numbers in increments of 3 within the specified range.

You can adjust the arguments to random.randrange() to generate random numbers within different ranges and step sizes based on your specific needs. Generating random numbers with Python randrange() is particularly useful when you need to work with values in specific ranges and want to control the step size for randomness.

Generating a Random Number using seed()

In Python, use "random.seed()" to control random number generation. This is helpful for getting the same random numbers across program runs. It starts the generator with a chosen seed value.

Here's an example:


In this instance, we employ the random module to generate numbers that are unpredictable.

  • Using the random module for generating random numbers.

  • First, create random_num1 in the range of 0 to 1 with random.random().

  • Establish a starting point for randomness using random.seed(5).

  • This seed ensures consistent sequences when the program is rerun with the same seed.

  • Generate random_num2, which follows the same sequence as random_num1 when seeded with 5.

  • Change the seed to 7 with random.seed(7) and create random_num3.

  • random_num3 maintains a consistent pattern when using the seed value 7.

  • Setting a seed allows for reproducible results in experiments or simulations.

Remember that using seed() is optional. If you don't set a seed, Python uses the current system time as a seed value by default, resulting in different random sequences every time you run your program.

Generating a Random Order using shuffle()

Python's random.shuffle() function rearranges the items in a list randomly. It is handy for activities such as mixing playing cards or experimenting with random outcomes.

Here are the steps to make the most of it:


In this example:

  1. We utilize the random module and establish a sample_list list containing the items 'A,' 'B,' 'C,' 'D,' and 'E.'

  1. We employ the random.shuffle() function to directly modify the arrangement of items within sample_list. This implies that the original list undergoes changes, and its elements are rearranged in a random order.

  1. We print the shuffled list to see the result. After the first shuffle, the order of elements is random, and we see the shuffled list.

  1. We shuffle the list again using random.shuffle(sample_list). This reorders the elements randomly once more, and we print the result.

Generating Random Floating-Point Numbers Using uniform()

In Python, you have the handy random.uniform() function at your disposal to generate random decimal numbers within a set range. This feature comes in handy when you require decimal numbers for different purposes, like simulations or math calculations.

Here's a step-by-step guide on how to utilize it:


The random floating-point number between 5 and 10 is: 7.548374857969512

In this example:

  1. We import the random module.

  1. We use the random.uniform function with inputs 5 and 10 to generate a random decimal between 5 (inclusive) and 10 (exclusive).

  1. We print the Python random float point number generated within the specified range.

The random.uniform() function is handy when you want to create random decimal numbers in a specific range. It's great for dealing with random continuous values.


In summary, Python's 'random' module provides programmers with a useful toolkit to create random numbers for various programming needs. It can produce random decimals and whole numbers, pick items from lists, and manage randomness for consistent results. Python's 'random' module is versatile and practical for tasks like games, simulations, data analysis, and more.

These functionalities in Python empower developers to effortlessly incorporate unpredictability into their programs, enhancing their flexibility and effectiveness. The ability to control, reorganize, and choose random elements adds an intriguing dimension to software development, making Python a superb option for individuals seeking to utilize randomness in their code.


1. How can I make my Python programs use randomness well?

To make your Python programs use randomness effectively, you can check out the 'random' module's functions like random(), randint(), choice(), and others. Think about what you need randomness for, like games, simulations, or data work, and then pick the right function to create random numbers the way you want.

2. How can I make my random number sequences reproducible in Python

Python allows you to make your random number sequences reproducible by using the seed function from the random module. By setting a seed value, you can ensure that the random numbers generated in your program remain consistent across different runs. This is particularly useful when you need to reproduce specific random sequences for experiments or simulations.

3. How do you create random decimal numbers within a certain range in Python?

To make random decimal numbers within a specific range in Python, you can use the 'random' module's uniform() function. This handy function lets you pick the range for your random decimals, which is great for simulating statistics or generating random continuous values.

4. How do I make Python create random numbers with a certain gap between them?

To create random whole numbers in Python that fit within a chosen range and have a specific gap between them, you can employ the 'randrange()' function found in the 'random' module. This function enables you to manage the gap between numbers, granting you precise authority over how the random numbers are produced.

5. Can I generate random numbers in Python for gaming and simulations?

Python's 'random' module is well-suited for generating random numbers in gaming simulations and other applications. You can use functions like randint() for randomizing game outcomes or uniform() for creating random values in statistical simulations. Python's versatility in random number generation makes it a valuable tool for game developers and data analysts alike.

Leave a Reply

Your email address will not be published. Required fields are marked *