Sep 16, 2019 · The idea of Python main function is to execute some code only when the Python script is executed directly. The function should not execute when the same script is imported as a Python module in another program.

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.

Apr 25, 2025 · Python looks for a file named __main__.py to start its execution automatically. If it doesn’t find it will throw an error else it will execute main.py and from the code, you can well understand that it will import the modules from src to find the area.

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 ...

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 ...

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.

Oct 28, 2010 · Often, a Python program is run by naming a .py file on the command line: $ python my_program.py You can also create a directory or zipfile full of code, and include a __main__.py. Then you can simply name the directory or zipfile on the command line, and it executes the __main__.py automatically:

Dec 5, 2024 · When developing Python applications and libraries, understanding the functionality of the __main__.py file is crucial. This post delves into the significance of __main__.py, explaining its purpose, structure, and when to incorporate it in your projects.

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.

Feb 16, 2025 · Python main functions with examples to grasp the significance of the main() function in Python scripts. Learn how to structure your Python code effectively.