# Workflow to run mypy on select parts of the CPython repo

name: mypy

on:

push:

branches:

- main

pull_request:

paths:

- ".github/workflows/mypy.yml"

- "Lib/_colorize.py"

- "Lib/_pyrepl/**"

- "Lib/test/libregrtest/**"

- "Lib/tomllib/**"

- "Misc/mypy/**"

- "Tools/build/check_extension_modules.py"

- "Tools/build/check_warnings.py"

- "Tools/build/compute-changes.py"

- "Tools/build/consts_getter.py"

- "Tools/build/deepfreeze.py"

- "Tools/build/generate-build-details.py"

- "Tools/build/generate_sbom.py"

- "Tools/build/generate_stdlib_module_names.py"

- "Tools/build/mypy.ini"

- "Tools/build/umarshal.py"

- "Tools/build/update_file.py"

- "Tools/build/verify_ensurepip_wheels.py"

- "Tools/cases_generator/**"

- "Tools/check-c-api-docs/**"

- "Tools/clinic/**"

- "Tools/jit/**"

- "Tools/peg_generator/**"

- "Tools/requirements-dev.txt"

workflow_dispatch:

permissions: {}

env:

PIP_DISABLE_PIP_VERSION_CHECK: 1

FORCE_COLOR: 1

TERM: xterm-256color # needed for FORCE_COLOR to work on mypy on Ubuntu, see https://github.com/python/mypy/issues/13817

concurrency:

group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}

cancel-in-progress: true

jobs:

mypy:

name: Run mypy on ${{ matrix.target }}

runs-on: ubuntu-latest

timeout-minutes: 10

strategy:

fail-fast: false

matrix:

target: [

"Lib/_pyrepl",

"Lib/test/libregrtest",

"Lib/tomllib",

"Tools/build",

"Tools/cases_generator",

"Tools/check-c-api-docs",

"Tools/clinic",

"Tools/jit",

"Tools/peg_generator",

]

steps:

- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

with:

persist-credentials: false

- uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0

with:

python-version: "3.13"

cache: pip

cache-dependency-path: Tools/requirements-dev.txt

- run: pip install -r Tools/requirements-dev.txt

- run: python3 Misc/mypy/make_symlinks.py --symlink

- run: mypy --config-file ${{ matrix.target }}/mypy.ini