Runnable Python module (Python 3)

Runnable Python module

When we import a module, its name (stored in the variable __name__) is equal to the module name. When a script is executed, its name is always set to the__main__ string.

Hence, if we check for this name with if __name__ == '__main__' we can detect if we are running as a script or if we're being included somewhere as a module.

I created a simple module in the following code crumb that does this check. Because we don't import this file but run it directly, the function is executed and we see something printed to our screen. However, if you would import this module, the function would not be called.

This example is from my articles on Python modules. Click to learn more about modules and packages.

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