python pass variable by reference
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In Python, when you pass a variable to a function, you are actually passing a reference to the object the variable refers to. However, it's important to understand the distinction between passing by reference and passing by value in Python.
Python passes variables by object reference, which means that when you pass a variable to a function, you are passing the reference to the object the variable points to. However, the reference itself is passed by value. This means that if you modify the object that the reference points to inside the function, the changes will be reflected outside the function. However, if you reassign the reference to a new object inside the function, it won't affect the original reference outside the function.
Let's illustrate this with some code examples:
In the modify_list function, the list is modified in place, and the changes are reflected outside the function. However, in the reassign_list function, a new list is assigned to the parameter lst, but it doesn't affect the original list outside the function.
Output:
In summary, while Python uses a form of pass-by-reference, the behavior can be effectively understood as "passing references by value." Modifications to mutable objects (like lists) inside a function will affect the original object outside the function, but reassigning a parameter inside a function won't affect the original reference outside the function.
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