id()
IntrospectionReturns the unique identity (memory address) of an object.
Signature
id(object)
Returns
intExample
a = [1, 2, 3] b = a print(id(a) == id(b)) # True (same object) c = [1, 2, 3] print(id(a) == id(c)) # False (different object)
About id()
id is a Python introspection function with the signature id(object). Returns the unique identity (memory address) of an object. It returns a value of type int.
Python provides a rich set of built-in functions and standard library modules that cover common programming tasks. Understanding these functions helps you write more idiomatic, efficient Python code. The idfunction is commonly used in data processing, web development, scripting, and automation tasks.
When working with id(), consider edge cases like empty inputs, None values, and type mismatches. Python's duck typing means many built-in functions work with any object that implements the required protocol (e.g., __len__ for len(), __iter__ for iteration). This flexibility is a key strength of Python's design philosophy.