Python Intermediate

What is Pydantic?

A data validation library that uses Python type annotations to validate and serialize data with automatic error reporting.

Pydantic models define data schemas using type hints. When data is passed to a model, it is automatically validated, converted to the correct type, and errors are reported in a structured format. Example: class User(BaseModel): name: str; age: int.

Pydantic v2 (rewritten in Rust) is significantly faster. It powers FastAPI's request/response validation, settings management, and is widely used for configuration files, API responses, and data processing pipelines.

Related Terms

Python Typing Module

A standard library module providing type hints for function signatures and variables, enabling static analysis without runtime enforcement.

Python Metaclass

A class whose instances are classes themselves — the class of a class that controls how classes are created and behaved.

A testing framework for Python that simplifies writing and running tests with powerful features like fixtures and parametrize.

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An object that manages resources by defining setup and cleanup actions using the with statement.

Special double-underscore methods that define how Python objects behave with built-in operations and functions.

A modern Python module providing an object-oriented interface for filesystem paths, replacing os.path operations.

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