Have you ever encountered a situation where you intended to import a specific class from a Python file, only to find that the entire file was executed? If so, you need to use the if __name__ == ‘__main__’ structure in the imported file.
The if __name__ == ‘__main__’: statement is a very important and commonly used code structure in Python. It is used to control the behavior of a module in different usage scenarios. The basic principle is that every Python module (.py file) has a built-in attribute __name__. When a module is run directly, the value of __name__ is set to ‘__main__’. When a module is imported into another module, the value of __name__ is the filename of that module (without the .py extension).
Therefore, placing statements that you do not want to execute when imported inside the if __name__ == ‘__main__’ block is sufficient.