Use flake8-type-checking

.flake8

@@ -4,6 +4,8 @@ max-line-length = 88
 ignore = E501, E203, W503, ANN101, ANN102, SIM106
 ban-relative-imports = True
 mypy-init-return = True
+enable-extensions = TC, TC1
+type-checking-exempt-modules = typing, typing-extensions
 format-greedy = 1
 per-file-ignores =
     __init__.py:F401

.pre-commit-config.yaml

@@ -44,6 +44,7 @@ repos:
           - flake8-eradicate==1.2.0
           - flake8-simplify==0.15.1
           - flake8-tidy-imports==4.6.0
+          - flake8-type-checking==1.3.3
           - flake8-use-fstring==1.3
 
   - repo: https://github.com/asottile/pyupgrade

src/poetry/core/masonry/builder.py

@@ -1,10 +1,11 @@
 from __future__ import annotations
 
-from pathlib import Path
 from typing import TYPE_CHECKING
 
 
 if TYPE_CHECKING:
+    from pathlib import Path
+
     from poetry.core.poetry import Poetry
 
 

src/poetry/core/masonry/utils/include.py

@@ -1,6 +1,10 @@
 from __future__ import annotations
 
-from pathlib import Path
+from typing import TYPE_CHECKING
+
+
+if TYPE_CHECKING:
+    from pathlib import Path
 
 
 class Include:

src/poetry/core/masonry/utils/package_include.py

@@ -1,10 +1,14 @@
 from __future__ import annotations
 
-from pathlib import Path
+from typing import TYPE_CHECKING
 
 from poetry.core.masonry.utils.include import Include
 
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
+
 class PackageInclude(Include):
     def __init__(
         self,

src/poetry/core/packages/utils/utils.py

@@ -28,15 +28,15 @@
 SUPPORTED_EXTENSIONS = ZIP_EXTENSIONS + TAR_EXTENSIONS
 
 try:
-    import bz2  # noqa: F401
+    import bz2  # noqa: F401, TC002
 
     SUPPORTED_EXTENSIONS += BZ2_EXTENSIONS
 except ImportError:
     pass
 
 try:
     # Only for Python 3.3+
-    import lzma  # noqa: F401
+    import lzma  # noqa: F401, TC002
 
     SUPPORTED_EXTENSIONS += XZ_EXTENSIONS
 except ImportError:

src/poetry/core/pyproject/toml.py

@@ -1,11 +1,12 @@
 from __future__ import annotations
 
-from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
 
 
 if TYPE_CHECKING:
+    from pathlib import Path
+
     from tomlkit.container import Container
     from tomlkit.items import Item
     from tomlkit.toml_document import TOMLDocument

src/poetry/core/version/parser.py

@@ -1,11 +1,12 @@
 from __future__ import annotations
 
-from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
 
 
 if TYPE_CHECKING:
+    from pathlib import Path
+
     from lark import Lark
     from lark import Tree
 

src/poetry/core/version/pep440/parser.py

@@ -9,12 +9,12 @@
 from packaging.version import VERSION_PATTERN
 
 from poetry.core.version.exceptions import InvalidVersion
-from poetry.core.version.pep440 import LocalSegmentType
 from poetry.core.version.pep440 import Release
 from poetry.core.version.pep440 import ReleaseTag
 
 
 if TYPE_CHECKING:
+    from poetry.core.version.pep440 import LocalSegmentType
     from poetry.core.version.pep440.version import PEP440Version
 
 

src/poetry/core/version/pep440/version.py

@@ -3,17 +3,21 @@
 import dataclasses
 import math
 
+from typing import TYPE_CHECKING
 from typing import Any
 from typing import TypeVar
 
 from poetry.core.version.pep440.segments import RELEASE_PHASE_ALPHA
 from poetry.core.version.pep440.segments import RELEASE_PHASE_DEV
 from poetry.core.version.pep440.segments import RELEASE_PHASE_POST
-from poetry.core.version.pep440.segments import LocalSegmentType
 from poetry.core.version.pep440.segments import Release
 from poetry.core.version.pep440.segments import ReleaseTag
 
 
+if TYPE_CHECKING:
+    from poetry.core.version.pep440.segments import LocalSegmentType
+
+
 T = TypeVar("T", bound="PEP440Version")
 
 # we use the phase "z" to ensure we always sort this after other phases

tests/pyproject/conftest.py

@@ -1,10 +1,14 @@
 from __future__ import annotations
 
-from pathlib import Path
+from typing import TYPE_CHECKING
 
 import pytest
 
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
+
 @pytest.fixture
 def pyproject_toml(tmp_path: Path) -> Path:
     path = tmp_path / "pyproject.toml"