Pydantic

pydantic is introduced in Brevvie Python + AI — Section 1: Setup Your IDE as the preferred way to validate and coerce user input in early Python programs.

Role in the source

• Turns typed model definitions into runtime validation.
• Converts compatible input like "42" into 42 when a field is annotated as int.
• Rejects invalid input with readable validation errors.

Why it matters

The lesson uses Pydantic as a bridge from beginner scripts to more reliable software, especially in the calculator exercises. See Python Input Validation.