Use pre-commit to invoke ruff, mypy

.github/workflows/pytest.yaml

@@ -14,7 +14,6 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  # See description in lint.yml
   depth: 100
 
 jobs:
@@ -26,8 +25,7 @@ jobs:
         - ubuntu-latest
         - windows-latest
         python-version:
-        - "3.7"  # Earliest version supported by ixmp
-        - "3.8"
+        - "3.8"  # Earliest version supported by ixmp
         - "3.9"
         - "3.10"
         - "3.11"  # Latest supported by ixmp
@@ -96,6 +94,9 @@ jobs:
     - name: Install Python package and dependencies
       # [docs] contains [tests], which contains [report,tutorial]
       run: |
+        # Work around https://bugs.launchpad.net/lxml/+bug/2035206
+        pip install "lxml != 4.9.3"
+
         pip install .[docs]
 
         # commented: use with "pandas-version" in the matrix, above
@@ -134,3 +135,19 @@ jobs:
 
     - name: Upload test coverage to Codecov.io
       uses: codecov/codecov-action@v3
+
+  pre-commit:
+    name: Code quality
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+
+    - name: Force recreation of pre-commit virtual environment for mypy
+      if: github.event_name == 'schedule'
+      run: gh cache list -L 999 | cut -f2 | grep pre-commit | xargs -I{} gh cache delete "{}" || true
+      env: { GH_TOKEN: "${{ github.token }}" }
+
+    - uses: pre-commit/[email protected]

.gitignore

@@ -50,8 +50,9 @@ rixmp/source/inst/docum/*.html
 # pytest and related
 .benchmarks
 .coverage*
-.pytest_cache
 .mypy_cache
+.pytest_cache
+.ruff_cache
 *.pid
 coverage.xml
 htmlcov

.pre-commit-config.yaml

@@ -0,0 +1,28 @@
+repos:
+- repo: local
+  hooks:
+  - id: mypy
+    name: mypy
+    always_run: true
+    require_serial: true
+    pass_filenames: false
+
+    language: python
+    entry: bash -c ". ${PRE_COMMIT_MYPY_VENV:-/dev/null}/bin/activate 2>/dev/null; mypy $0 $@"
+    additional_dependencies:
+    - mypy
+    - genno
+    - GitPython
+    - nbclient
+    - pytest
+    - sphinx
+    - xarray
+    args: ["."]
+- repo: https://github.com/psf/black
+  rev: 23.7.0
+  hooks:
+  - id: black
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  rev: v0.0.287
+  hooks:
+  - id: ruff

RELEASE_NOTES.rst

@@ -4,6 +4,7 @@ Next release
 .. All changes
 .. -----------
 
+- Support for Python 3.7 is dropped (:pull:`492`).
 - New :func:`.utils.discard_on_error` and matching argument to :meth:`.TimeSeries.transact` to avoid locking :class:`.TimeSeries` / :class:`.Scenario` on failed operations with :class:`.JDBCBackend` (:pull:`488`).
 
 .. _v3.7.0:

doc/install.rst

@@ -31,6 +31,11 @@ Use cases for installing ixmp directly include:
 Install system dependencies
 ===========================
 
+Python
+------
+
+Python version 3.8 or later is required.
+
 GAMS (required)
 ---------------
 

ixmp/__init__.py

@@ -1,9 +1,5 @@
 import logging
-
-try:
-    from importlib.metadata import PackageNotFoundError, version
-except ImportError:  # Python 3.7
-    from importlib_metadata import PackageNotFoundError, version  # type: ignore
+from importlib.metadata import PackageNotFoundError, version
 
 from ixmp._config import config
 from ixmp.backend import BACKENDS, IAMC_IDX, ItemType

pyproject.toml

@@ -5,12 +5,10 @@ requires = ["build", "setuptools-scm"]
 dynamic = ["version"]
 name = "ixmp"
 description = "The ix modeling platform"
-authors = [
-  { name = "IIASA Energy, Climate, and Environment (ECE) program" },
-]
+authors = [{ name = "IIASA Energy, Climate, and Environment (ECE) program" }]
 maintainers = [
-  {name = "Paul Natsuo Kishimoto", email = "[email protected]"},
-  {name = "Fridolin Glatter", email = "[email protected]"},
+  { name = "Paul Natsuo Kishimoto", email = "[email protected]" },
+  { name = "Fridolin Glatter", email = "[email protected]" },
 ]
 readme = "README.md"
 classifiers = [
@@ -22,7 +20,6 @@ classifiers = [
   "Operating System :: OS Independent",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.7",
   "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
@@ -31,11 +28,10 @@ classifiers = [
   "Topic :: Scientific/Engineering",
   "Topic :: Scientific/Engineering :: Information Analysis",
 ]
+requires-python = ">=3.8"
 dependencies = [
   "click",
-  "genno <= 1.13; python_version < '3.8'",
-  "genno >= 1.16; python_version >= '3.8'",
-  "importlib_metadata; python_version < '3.8'",
+  "genno >= 1.16",
   "JPype1 >= 1.2.1",
   "openpyxl",
   "pandas >= 1.2",
@@ -75,9 +71,7 @@ tests = [
 ixmp = "ixmp.cli:main"
 
 [tool.coverage.report]
-omit = [
-  "ixmp/utils/sphinx_linkcode_github.py",
-]
+omit = ["ixmp/utils/sphinx_linkcode_github.py"]
 
 [tool.isort]
 profile = "black"
@@ -112,6 +106,16 @@ markers = [
   "performance: ixmp performance test.",
 ]
 
+[tool.ruff]
+select = ["C9", "E", "F", "I", "W"]
+
+[tool.ruff.mccabe]
+# FIXME the following exceed this limit
+# .backend.io.s_read_excel: 26
+# .backend.jdbc.JDBCBackend.item_get_elements: 19
+# .core.scenario.Scenario.add_set: 17
+max-complexity = 15
+
 [tool.setuptools.packages]
 find = {}