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Python File Format | .py Extension

Last Updated : 21 Mar, 2024
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What is the .py file?

Py stands for the Python program files. Python is one of the most powerful, and versatile programming languages, Python is easy to learn and is widely used among developers. These days, the Python language is quite well-known. It can be applied to mathematics, web and software development, and system programming.

It is a cross-platform Programming language. We can use it to run on various operating systems including Windows, MAC, Linux, Raspberry Pi, and others. Python is like English and that is easy to understand. A few lines of Python code can be used by developers to create a workable software application. It is ideal for prototyping since it is an interpreter-based programming language that allows code to be executed immediately upon writing.

Example of the code

# Python code to calculate the factorial of a number 
def calculate_factorial(number): 
    if number == 0 or number == 1: 
        return 1
        return number * calculate_factorial(number - 1) 
# Prompt the user for a number 
user_number = int(input("Enter a non-negative integer: ")) 
# Check if the user entered a non-negative integer 
if user_number >= 0: 
    # Calculate the factorial using the function 
    result = calculate_factorial(user_number) 
    # Display the result 
    print(f"The factorial of {user_number} is: {result}") 
    # Handle the case where the user didn't enter a non-negative integer 
    print("Invalid input. Please enter a non-negative integer.") 


  • Their is a function called calculate_factorial that takes a parameter number. This function will calculate the factorial of the given number using recursion.
  • The input function prompts the user to enter a non-negative integer, and int is used to convert the input to an integer.
  • The calculate_factorial function is called with user_number as an argument to calculate the factorial.
  • The result is then printed using the print function.
  • If the user enters a negative number, an error message is displayed.


The factorial of 5 is: 120

Features of Python

  • Python’s syntax is easy to read and understand, making it good for beginners. The language emphasizes code readability, reducing the cost of program maintenance and development.
  • It allows developers to express code in fewer lines of code than languages like C++ or Java. This leads to a more concise coding style.
  • Python is an interpreted language, allowing for dynamic code execution without the need of a compilation step. This facilitates rapid development and testing.
  • It is dynamically typed means that variable types are determined at runtime.
  • Python supports OOPs principles, allowing developers to code using classes and objects.
  • It comes with a number of standard library that includes modules and packages for a wide range of functionalities, including web development, data processing, networking, and file I/O.

Application of the python

  • Machine Learning and Artificial Intelligence
  • Data Science
  • Audio and Visual Applications
  • Audio and Visual Applications

How to use the .py file

  • Create a Python Script: Write your Python code in a file and save it with .py extension. For example, you can create a file named and add the following code /* print(“Hello, World!”) */
  • Open a Terminal: Open a terminal or command prompt on your computer.
  • Navigate to the Script’s Directory: Navigate to python file directory using the cd command.
  • Run the Python Script: Once you are in the correct directory, run the Python script using the python command followed by the script’s filename If you are using Python 3, you might need to use python3.
  • View the Output: After running the script, you should see the output printed to the terminal or command prompt

Advantages of Python

  • Once you understand how to interpret Python’s error traces, you’ll be able to quickly identify and fix the majority of your program’s problems.
  • When we write Python programmes, we don’t need to remember the system architecture or manage memory.
  • It is very easy to code in the Python language and anybody can learn Python basics in a few hours or days.
  • Python has a large standard library that includes a variety of modules and functions, so you don’t have to write your own code for everything.

Disadvantages of Python

  • Python language is slow at the runtime as compared to other language.
  • For mobile development, Python is not a very good language, it is very rarely used for mobile development.
  • Due to the flexible data types python consume high memory.


Python is more popular and demanding than other programming languages for a variety of reasons. We’ve covered all of the points that any beginner learning Python should be aware of. If you want to be a Python developer, you should learn Python thoroughly and work to grasp more advanced concepts.


Q1. What are Some of the Most Popular Python Libraries?

Ans: NumPy, Pandas, Django and more are some python libraries used by the developer to develop different type of application.

Q2. Why is Python Used for Data Science?

Ans: Python is used for the data science because the language is readable and scalable also it provide the rich ecosystem of the libraries.

Q3. What type of language is Python?

Ans: Python is high level language that support the concept of the object oriented language.

Q4. What is a list in Python?

Ans: It is a mutable or changeable data structure to store elements in ordered way.

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