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Python Intermediate

What is Python Typing Module?

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

The typing module (introduced in Python 3.5) provides tools for type annotations: List[int], Dict[str, Any], Optional[str], Union[int, str], Tuple, Set, and custom types via TypeVar and Generic. Type hints document expected types, enable IDE autocompletion, and allow static analysis tools (mypy, pyright, pytype) to catch type errors before runtime. Modern Python (3.10+) supports Union types with X | Y syntax and built-in generics (list[int] instead of List[int]). Type hints are not enforced at runtime by default — they are metadata for tools and developers. TypedDict, Protocol, and Literal provide advanced typing capabilities.

Related Terms

Python Property
A built-in decorator that lets you define methods that behave like attributes, enabling controlled access to instance data.
Type Hints
Optional annotations that indicate the expected types of variables, function parameters, and return values.
Python Iterator Protocol
The interface requiring __iter__() and __next__() methods, enabling objects to be used in for loops and other iteration contexts.
Python Interpreter
The program that reads and executes Python code, translating it into machine instructions at runtime.
Module
A Python file containing definitions and statements that can be imported and reused in other Python programs.
ABC (Abstract Base Class)
A class that defines a common interface for subclasses by declaring abstract methods that must be implemented.
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