is python call by reference or value

Publicado em: 25 Dezembro 2023
no canal de: CodeLink

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Python uses a mechanism called "call by object reference" or "pass by assignment" when passing arguments to functions. Understanding this concept is crucial for effectively working with Python functions. In Python, everything is an object, and variables hold references to these objects.
When a variable is passed to a function, the reference to the object is passed, not the actual object itself. This means that changes made to the object inside the function affect the original object outside the function. However, reassigning the parameter variable inside the function does not affect the original variable outside the function.
Let's explore this concept with some code examples:
In this example, we define a function modify_list that takes a list as an argument, appends the value 4 to it, and then reassigns the parameter variable lst to a new list [1, 2, 3]. Let's analyze the output:
As you can see, the list is modified inside the function, and the appended value is reflected in the original list outside the function. However, reassigning the parameter variable lst inside the function does not affect the original list.
In Python, it's important to recognize that the behavior of passing arguments to functions is neither strictly "call by value" nor "call by reference." Instead, it's more accurate to describe it as "call by object reference." Understanding this concept helps you write more predictable and maintainable code.
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