Mr. Graph – A graph definition and execution library for Python

In plain words

Mr. Graph is a Python library for composing graphs of synchronous and asynchronous functions. It uses Google-style docstrings to automatically generate dataclasses and chain function calls into directed acyclic graphs. The library supports linear, fan-in, and fan-out layouts while inferring pipelines from function signatures. It is designed for developers and systems engineers who need lightweight function composition without the overhead of full workflow orchestration engines.

written from the facts on this page · September 2026

From the sources

Mr. Graph is a python library designed to make composing graphs of sync and async functions easy! The purpose of Mr. Graph is to provide an efficient graph processing library for I/O bound functions. All blocking calls are ran in their own threads, and are executed concurrently with async functions. As these functions return their results, downstream functions are executed when their dependencies are done being computed. Return values are always wrapped in dataclasses whose names and types are specified using docstrings on the functions. This project might be useful for you if you have a graph of API calls to make which depend on each other. Mr. Graph is new and under active development.…from mr-graph.readthedocs.io

In the maker’s words, at launch

What: Mr. Graph is a python library designed to make composing graphs of sync and async functions easy! Use google style docstrings to automagically create dataclasses and chain together function calls into graphs. Why: I like the design of Dagster, but not the latency. For apps and systems engineering, sometimes I…

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