Build It in Python: Designing Applications

Move from writing scripts to structuring applications.

Programs start to take shape around classes that hold both data and behavior. Functions become methods. Data that was loosely stored earlier is replaced with objects that define what belongs and what does not.

Work moves through a sequence of projects that grow in scope. A contact book turns into a multi-class program with persistence. An expense tracker adds filtering, summaries, and validation. A task manager expands into a multi-file p...