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Top 18 Python Type Projects
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Project mention: Ty: An fast Python type checker and language server, written in Rust | news.ycombinator.com | 2025-05-07
https://github.com/python/mypy/blob/501a07b45af8e44eda665e53...
Also did you know mypy ignores typing of class decorators? You simply can't return a different type other than type[thisclass].
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pytype is based in part upon byterun https://github.com/google/pytype/blob/main/docs/developers/i...
I learnt a lot about bytecode interpreters from working on it, and it helped me understand the cpython source code a lot more easily from having played with a python translation of it first.
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Project mention: Ty: An fast Python type checker and language server, written in Rust | news.ycombinator.com | 2025-05-07
Two examples that come to mind are: https://discuss.python.org/t/pep-692-using-typeddict-for-mor...
and: https://github.com/python/typing/issues/1252
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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Maat
Validation and transformation library powered by recursive descent validation algorithm. Made to be extended for any kind of project.
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compressio
Lossless in-memory compression of pandas DataFrames and Series powered by the visions type system. Up to 10x less RAM needed for the same data.
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Poly
A Fluid, PolyMorphic,and shapeless Types Package that activates radically flexiblity and simplicity in your programs (by kyegomez)
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db-introspector-gadget
This is a CLI tool that can introspect MySQL or Postgres databases and generate a python file that contains TypedDict definitions for the tables and columns in the provided database schema.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Python Types discussion
Python Types related posts
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Ty: An fast Python type checker and language server, written in Rust
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Mypy – an optional static type checker for Python
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You Need Subtyping
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Astral – "We're building a new static type checker for Python"
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Python Type System Conformance Test Results
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Duck Typing Meets Type Hints: Using Protocols in Python
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Free-threaded CPython is ready to experiment with
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A note from our sponsor - InfluxDB
www.influxdata.com | 14 Jul 2025
Index
What are some of the best open-source Type projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | mypy | 19,494 |
| 2 | pytype | 4,904 |
| 3 | typeshed | 4,731 |
| 4 | Schematics | 2,586 |
| 5 | typing | 1,664 |
| 6 | sqlalchemy-stubs | 575 |
| 7 | typed-argument-parser | 572 |
| 8 | traits | 454 |
| 9 | pyanalyze | 369 |
| 10 | lagom | 318 |
| 11 | pfun | 150 |
| 12 | celery-types | 109 |
| 13 | Maat | 30 |
| 14 | compressio | 28 |
| 15 | Poly | 9 |
| 16 | db-introspector-gadget | 1 |
| 17 | thsl | 1 |
| 18 | typebuf | 0 |
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