When an object is passed as an argument, it is actually a reference to the object that is passed.

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Quizplus · Accepted Answer

In many programming languages, including Python and Java, when an object is passed to a function or method, what is actually passed is a reference to the object, not a copy of the object itself. This means that changes to the object within the function can affect the original object outside the function.

When an Object Is Passed as an Argument, It Is