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Section 13.7 Objects as Arguments and Parameters

You can pass an object as an argument in the usual way. Here is a simple function called distance involving our new Point objects. The job of this function is to figure out the distance between two points.
distance takes two points and returns the distance between them. Note that distance is not a method of the Point class. You can see this by looking at the indentation pattern. It is not inside the class definition. The other way we can know that distance is not a method of Point is that self is not included as a formal parameter. In addition, we do not invoke distance using the dot notation.
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