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Only When Your Module Is the Main Program. If your module is the main program, then it will see that __name__ was indeed set to "__main__" and it calls the two functions, printing the strings "Function A" and "Function B 10.0". Only When Your Module Is Imported by Another
Learn what if __name__ == "__main__" does in Python and when to use it. This tutorial covers the basics, the use cases, and the alternatives of the name-main idiom.
Learn how to use the special variable __name__ to check if a Python module is run directly or imported by another module. See examples, advantages and applications of this technique in Python programming.
Learn how to use if __name__ == __main__ to check if a Python file is run directly or imported. See how to execute functions and modules with different scenarios and conventions.
The main function serves as the cornerstone of Python programming, providing a structured and organized framework for executing the program's core logic. By understanding its definition and using the if __name__ == '__main__' guard, developers can ensure that their programs behave as intended when run directly or imported as modules.
The main_program.py script imports the math_operations module and uses its add function to perform an addition operation. The if __name__ == "__main__": block in this script will be executed when the script is run directly. When you run main_program.py using the command: python main_program.py. You will see the following output:
Learn how to use the if __name__ == "__main__" block in Python to execute code only when a file is run as a script, not imported as a module. See examples, best practices, and tips for this conditional statement.
When a Python script is run, the __name__ variable is set to "__main__", indicating that the script is being run as the main program.. When a Python script is imported as a module into another script, the __name__ variable is set to the name of the script/module.. So, code within the if __name__ == "__main__": block will only be executed if the script is run directly, not when it is imported ...
When a Python file is executed, the `__name__` attribute is set to `"__main__"`, indicating it is being run as the main program. This mechanism allows you to designate some portion of your Python code to be executed only when the script is run directly, not when it is imported as a module in another script.
How Does __name__ == "__main__" Works?. The if __name__ == '__main__' conditional statement is a Python programming construct that controls the execution of a script. When a Python script is run, the interpreter sets the name variable to the string '__main__' if the script is the main program being executed.If the file is being imported as a module, then name variable is set to the ...