Web Reference: len is a function to get the length of a collection. It works by calling an object's __len__ method. __something__ attributes are special and usually more than meets the eye, and generally should not be called directly. In this tutorial, you'll learn how and when to use the len () Python function. You'll also learn how to customize your class definitions so that objects of a user-defined class can be used as arguments in len (). The built-in function len() calls the magic method __len__(). So in your example, there is no difference in the result. It's just that len() is neater.
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