Course Enrollment System: Python Foundation Capstone

120 min · Hard

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A course enrollment system is a classic interview project: it has rules, limits, waiting lists and saved data, so it shows how you design with classes, collections, exceptions and files.

What you will learn

Design a small system from classes, dataclasses and collections with clear responsibilities
Model rule violations with a family of custom exceptions under one base class
Handle waitlists and promotions with deque, and counts with Counter and defaultdict
Save and load the whole system as JSON in a relative file, including missing and corrupt files
Explain the design choices in an interview

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