In this step-by-step tutorial, you'll learn how Python main functions are used and some best practices to organize your code so it can be executed as a script and imported from another module.

Aug 9, 2024 · main() function in Python, when the command to run a Python program is given to the interpreter, the code that is at level 0 indentation is to be executed. However, before doing that, it will define a few special variables. __name__ is one such special variable. If the source file is executed as the main program, the interpreter sets the

Mar 19, 2014 · The if statement allows you to create a main function which will be executed if your file is loaded as the "Main" module rather than as a library in another module.

1 day ago · In Python, the special name __main__ is used for two important constructs: the name of the top-level environment of the program, which can be checked using the __name__ == '__main__' expression; and the __main__.py file in Python packages.

May 25, 2022 · In this guide, I’ll explain how including a main () function, though not required in Python, can structure your programs in a logical way and ensure that your functions are executed only when expected.

Jan 24, 2024 · In Python programming, the def main() function plays a crucial role, serving as the entry point for executing code when a Python script is run. Understanding how to utilize def main() enhances code organization, readability, and modularity.

Sep 16, 2019 · How to Write a Python main Function? When we run a python program, it executes all the statements inside it. So, if we have a main () function and we call it in the program directly, it will get executed all the time, even when the script is imported as a module.

Apr 1, 2025 · There is a special function in Python that helps us to invoke the functions automatically by operating the system during run-time or when the program is executed, and this is what we call as the main function.

Here, we have created a custom main() function in the helloworld.py file. It is executed only when the program is run as a standalone script and not as an imported module. This is the standard way to explicitly define the main() function in Python. It is one of the most popular use cases of __name__ variable of a Python file. Also Read: Python ...

The if __name__ == "__main__" construct is a fundamental Python feature for writing organized, reusable, and well-structured scripts. Understanding when and how to use it effectively will help improve the modularity of your code.