Python Data Model Explained: Identity, Equality, and Mutability Demystified

A new tutorial series on DEV Community introduces Python's data model, covering how the language internally represents and manages objects. Every Python object carries three core attributes: an identity (memory address), a type, and a value. The article clarifies the critical difference between identity checks using 'is' and equality checks using '==', explaining when each should be used. It also distinguishes between mutable types, such as lists and dictionaries, and immutable types, such as integers and strings, showing how mutation differs from reassignment. The piece is the first in a multi-part series aimed at intermediate Python developers looking to avoid common bugs around aliasing and unexpected side effects.