Repo brief: google/pytype

Generated by RepoPilot · document generated 2026-09-16 · concise human review Evidence snapshot · analyzed 2026-09-16T18:17:20.912Z · commit f411a8b445c1

Verdict

Healthy — Healthy across all four use cases

• Last commit 6mo ago
• 9 active contributors
• Distributed ownership (top contributor 49% of recent commits)
• MIT licensed
• 2 more receipts on the live page

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against dependency CVEs from deps.dev and OpenSSF Scorecard

What it is

Pytype is a static type analyzer for Python code that performs compile-time type checking using bytecode-based inference and inline PEP 484 annotations. It combines type inference with interface files to detect type errors before runtime without requiring full type annotations. Monolithic package structure: pytype/ contains the core analyzer split into abstract/ (type system and inference), ast/ (Python AST handling), and top-level modules like analyze.py. C++ and CMake files (CMakeLists.txt, PyTypeUtils.cmake) indicate native extensions for performance-critical bytecode analysis. build_scripts/ contains CI/release automation. Out-of-tree outputs in out/.

Start here

Open these first:

• pytype/analyze.py — Main entry point for the type analysis pipeline that orchestrates reading, parsing, and type-checking Python files.
• pytype/abstract/abstract.py — Core abstract value representation system that models Python types and objects during inference.
• pytype/convert.py — Converts between pytd (type definition) representations and runtime abstract values, bridging type stubs and analysis.
• pytype/imports/module_loader.py — Loads and caches type stubs and modules, enabling cross-module type resolution.
• pytype/config.py — Configuration parsing and validation for pytype's analysis parameters and command-line options.

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

Clone the repository: git clone https://github.com/google/pytype.git && cd pytype. Install dependencies using the included requirements.txt (uv-managed): pip install -r requirements.txt or `uv pip install -r require…

Daily commands:

Based on build_scripts/ci_script.sh and CMakeLists.txt: cmake . && ninja to build. Run analyzer on a Python file: python -m pytype <file.py>. Run tests: python build_scripts/run_tests.py or invoke pytest directly…

…shortened for this brief.

Key cautions & unknowns

• Slowing — last commit 6mo ago
• Scorecard: marked unmaintained (0/10)
• 1. Bytecode stability: pytype's architecture depends heavily on CPython internals (bytecode format, opcode definitions) which change between minor versions—modifications must account for version-specific bytecode…
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests
• OpenSSF Scorecard
• License evidence

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

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