What is __main__ in Python?

The if __name__ == '__main__': block in Python is a common idiom used to check whether the current script is being run directly as the main program.

When a Python module is imported by another script, the code within that module is executed. However, sometimes you may want to have certain code run only when the script is executed directly, and not when it is imported as a module.

In the case of a Flask application, the if __name__ == '__main__': block is used to ensure that the Flask development server only starts if the script is being executed directly. This prevents the server from starting if the script is imported by another module.

In summary, the if __name__ == '__main__': block ensures that the code within it is only executed when the script is run directly, allowing you to control which code gets executed when the script is imported by another module.

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