Introduction

typemap is a runtime type evaluation library for Python 3.14+ that implements the type manipulation operators from PEP 827.

Installation

pip install typemap

Quick Example

from typemap import eval_typing
import typemap_extensions as tm

class User:
    name: str
    age: int
    email: str

# Get all field names at runtime!
keys = eval_typing(tm.KeyOf[User])
# Returns: tuple[Literal["name"], Literal["age"], Literal["email"]]

What Can You Do?

• Introspect types - Get field names, types, annotations
• Transform types - Pick, omit, make optional, etc.
• Build dynamically - Create protocols, classes at runtime
• Validate - Check type compatibility at runtime

Getting Started

Type Utilities

Requirements

• Python 3.14+
• typing_extensions >= 4.0

Credits

This project is 100% inspired by vercel/python-typemap. All credit goes to them - they are the real creators of this implementation.

We hope with all our hearts that PEP 827 will be accepted!