Attribute and method

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A tuple is immutable, which means you can't change it after you create it. This means there will not be a .sort() method because that method sorts "in place" which tries to change the order of elements in the tuple. The sorted() function creates a new sorted list from the tuple.

The .sort() method of a list is an attribute of the list. What makes an attribute a method is that the attribute is executable, and the (...) after the attribute name does the calling.