Lecture 12:- Id() in Python

In Python, id() is a built-in function that returns the unique identity (memory address) of an object. The identity of an object is a unique integer value that remains constant during its lifetime. It serves as an identifier for the object, allowing you to distinguish one object from another.

The syntax of the id() function is as follows:

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id(object)

Here, object is the object whose identity you want to retrieve.

Example:

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x = 42 y = "Hello" z = [1, 2, 3] print(id(x))  # Output: A unique integer value representing the memory address of x print(id(y))  # Output: A unique integer value representing the memory address of y print(id(z))  # Output: A unique integer value representing the memory address of z

Note that for immutable objects (e.g., integers, strings), the id() will remain the same throughout the object's lifetime because these objects cannot be modified in place. However, for mutable objects (e.g., lists, dictionaries), the id() can change if the object is modified, as the Python interpreter may decide to move the object to a different memory location to accommodate its new size.

The id() function is mostly used for debugging or understanding object behavior, and it is not recommended to use it for comparison or logic operations in regular programming. For equality comparison, use the == operator instead of comparing id() values.