fix: support lazy imports in Python 3.15+

.pre-commit-config.yaml

@@ -15,6 +15,13 @@ repos:
         args: [ --fix ]
       - id: ruff-format
 
+  - repo: https://github.com/henryiii/flake8-lazy
+    rev: 2db69f40494cc912ede966160695ede82eb6ebac  # frozen: v0.10.1
+    hooks:
+      - id: flake8-lazy
+        files: ^src/
+        args: [--apply, set]
+
   - repo: https://github.com/pre-commit/pygrep-hooks
     rev: 3a6eb0fadf60b3cccfd80bad9dbb6fae7e47b316  # frozen: v1.10.0
     hooks:

src/packaging/_elffile.py

@@ -9,6 +9,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"struct", "typing"}
+
 import enum
 import os
 import struct

src/packaging/_manylinux.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = {"re", "warnings", f"{__spec__.parent}._elffile"}
+
 import collections
 import contextlib
 import functools

src/packaging/_musllinux.py

@@ -6,6 +6,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"subprocess", f"{__spec__.parent}._elffile"}
+
 import functools
 import re
 import subprocess

src/packaging/_parser.py

@@ -6,6 +6,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"ast", f"{__spec__.parent}._tokenizer"}
+
 import ast
 from collections.abc import Sequence
 from typing import Literal, NamedTuple, TypeAlias

src/packaging/dependency_groups.py

@@ -1,5 +1,11 @@
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "collections.abc",
+    f"{__spec__.parent}.errors",
+    f"{__spec__.parent}.requirements",
+}
+
 import re
 from collections.abc import Mapping, Sequence
 

src/packaging/direct_url.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = {"collections.abc", "urllib.parse"}
+
 import dataclasses
 import re
 import urllib.parse

src/packaging/errors.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = {"typing"}
+
 import contextlib
 import dataclasses
 import sys

src/packaging/licenses/__init__.py

@@ -31,6 +31,8 @@
 #######################################################################################
 from __future__ import annotations
 
+__lazy_modules__ = {f"{__spec__.parent}._spdx"}
+
 import re
 from typing import NewType, cast
 

src/packaging/markers.py

@@ -4,6 +4,14 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "platform",
+    f"{__spec__.parent}._parser",
+    f"{__spec__.parent}._tokenizer",
+    f"{__spec__.parent}.specifiers",
+    f"{__spec__.parent}.utils",
+}
+
 import functools
 import operator
 import os

src/packaging/metadata.py

@@ -1,5 +1,14 @@
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "email.header",
+    "email.parser",
+    "keyword",
+    "pathlib",
+    f"{__spec__.parent}",
+    f"{__spec__.parent}.errors",
+}
+
 import email.header
 import email.message
 import email.parser

src/packaging/pylock.py

@@ -6,6 +6,17 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "collections.abc",
+    "datetime",
+    "urllib.parse",
+    f"{__spec__.parent}.markers",
+    f"{__spec__.parent}.specifiers",
+    f"{__spec__.parent}.tags",
+    f"{__spec__.parent}.utils",
+    f"{__spec__.parent}.version",
+}
+
 import dataclasses
 import logging
 import re

src/packaging/ranges.py

@@ -19,6 +19,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"bisect", f"{__spec__.parent}._ranges"}
+
 import bisect
 import enum
 import typing

src/packaging/requirements.py

@@ -3,6 +3,15 @@
 # for complete details.
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "copy",
+    f"{__spec__.parent}._parser",
+    f"{__spec__.parent}._tokenizer",
+    f"{__spec__.parent}.markers",
+    f"{__spec__.parent}.specifiers",
+    f"{__spec__.parent}.utils",
+}
+
 import builtins
 import copy
 import sys

src/packaging/specifiers.py

@@ -10,6 +10,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {f"{__spec__.parent}._ranges", f"{__spec__.parent}.utils"}
+
 import abc
 import builtins
 import re

src/packaging/tags.py

@@ -4,6 +4,17 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "importlib.machinery",
+    "operator",
+    "platform",
+    "re",
+    "struct",
+    "subprocess",
+    "sysconfig",
+    f"{__spec__.parent}",
+}
+
 import logging
 import operator
 import platform

src/packaging/utils.py

@@ -4,6 +4,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {f"{__spec__.parent}.tags", f"{__spec__.parent}.version"}
+
 import re
 from typing import NewType, cast
 

src/packaging/version.py

@@ -9,6 +9,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"functools"}
+
 import builtins
 import re
 import sys