If Name Python

Conclusion. Using if __name__ '__main__' in your Python code is a best practice that enhances the modularity and reusability of your code. It ensures that certain code blocks run only when the module is executed directly, not when it is imported. This is particularly useful for testing and creating scripts that can be both standalone programs and reusable modules.

It allows you to differentiate between script execution as a standalone program or as an imported module. Understanding how the Python main function works is essential for writing modular and reusable Python code. Understanding quot__name__quot in Python. Every Python script has a built-in variable called quot__name__quot.

In Python, __name__ is a special variable assigned to the name of the Python module by the interpreter. If your module is invoked as a script, then the string '__main__' will automatically be assigned to the special variable __name__.But if you import your module into another module, the string 'my_module' will be assigned to __name__.

When you run Python interactively the local __name__ variable is assigned a value of __main__. Likewise, when you execute a Python module from the command line, rather than importing it into another module, its __name__ attribute is assigned a value of __main__, rather than the actual name of the module.

When a Python interpreter reads a Python file, it first sets a few special variables. Then it executes the code from the file. One of those variables is called __name__. If you follow this article step-by-step and read its code snippets, you will learn how to use if __name__ quot__main__quot, and why it's so important. Python Modules Explained

Before executing code, Python interpreter reads source file and define few special variablesglobal variables. If the python interpreter is running that module the source file as the main program, it sets the special __name__ variable to have a value quot__main__quot.If this file is being imported from another module, __name__ will be set to the module's name.

So, when a module is imported from another file, __name__ stores the module name. When run from the command line using the python or python3 command, __name__ stores the string '__main__'. Note that the string '__main__' is also stored in __name__ when the python command is executed as a module using the -m option or in interactive mode.

The special __name__ variable in Python is a string that contains the name of the current module. If the module is the main program, __name__ will be set to the string quot__main__quot. The if __name__ quot__main__quot idiom is used to execute some code only if the file containing it is being run as the main program. This is useful for breaking up a program into multiple files, or for running code

Python's name-main idiom isn't special. It's just a conditional check. It may look cryptic at first, especially when you're starting to work with Python and you're used to Python's slim and elegant syntax. After all, the name-main idiom includes a dunder variable from the global namespace, and a string that's a dunder value as

Python sets this variable to the module name, which Python's import system uses to identify each module uniquely. However, if the module is in the top-level code environment, which means it's the module used as the entry point for the program, Python sets the attribute __name__ to the string quot__main__quot. Let's look at some examples.