Drop support python 3.7 on runtime (#2060)

* Drop support python 3.7 on runtime

* Drop support python 3.7 on runtime

* remove unused code

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fix imports

* Fix pydantic patch

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
         os: [ubuntu-latest, windows-latest, macos-latest]
         isort-version: [4.3.21, 5.6.4]
         black-version: [22.1.0, default]
@@ -39,16 +39,6 @@ jobs:
             black-version: 23.12.1
             python-version: 3.12
             pydantic-version: 2.4.2
-          - os: macos-13
-            isort-version: 5.6.4
-            black-version: 22.1.0
-            python-version: 3.7
-            pydantic-version: 2.4.2
-          - os: macos-13
-            isort-version: 5.6.4
-            black-version: 22.1.0
-            python-version: 3.7
-            pydantic-version: 1.10.9
         exclude:
           - os: windows-latest
             black-version: 22.1.0
@@ -58,8 +48,6 @@ jobs:
             isort-version: 4.3.21
           - os: macos-latest
             isort-version: 4.3.21
-          - os: macos-latest
-            python-version: 3.7
           - os: windows-latest
             pydantic-version: 1.5.1
           - os: macos-latest
@@ -85,18 +73,8 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Install old Poetry
-      uses: snok/install-poetry@v1
-      if: matrix.python-version == '3.7'
-      with:
-        version: 1.4.2
-        virtualenvs-path: .venv
-        virtualenvs-create: true
-        virtualenvs-in-project: true
-        installer-parallel: true
     - name: Install Poetry
       uses: snok/install-poetry@v1
-      if: matrix.python-version != '3.7'
       with:
         version: 1.7.1
         virtualenvs-path: .venv

datamodel_code_generator/__init__.py

@@ -66,14 +66,9 @@ def get_version() -> str: ...
     def get_version() -> str:
         package = 'datamodel-code-generator'
 
-        try:
-            from importlib.metadata import version
-
-            return version(package)
-        except ImportError:
-            import pkg_resources
+        from importlib.metadata import version
 
-            return pkg_resources.get_distribution(package).version
+        return version(package)
 
 
 def enable_debug_message() -> None:  # pragma: no cover

datamodel_code_generator/pydantic_patch.py

@@ -17,5 +17,6 @@ def patched_evaluate_forwardref(
         )
 
 
-if '3.12' in sys.version:  # pragma: no cover
+# Patch only Python3.12
+if sys.version_info >= (3, 12):
     pydantic.typing.evaluate_forwardref = patched_evaluate_forwardref

datamodel_code_generator/util.py

@@ -1,8 +1,17 @@
 from __future__ import annotations
 
 import copy
+from functools import cached_property  # noqa: F401
 from pathlib import Path
-from typing import TYPE_CHECKING, Any, Callable, Dict, TypeVar
+from typing import (  # noqa: F401
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Dict,
+    Protocol,
+    TypeVar,
+    runtime_checkable,
+)
 
 import pydantic
 from packaging import version
@@ -15,46 +24,17 @@
 PYDANTIC_V2: bool = PYDANTIC_VERSION >= version.parse('2.0b3')
 
 if TYPE_CHECKING:
-    cached_property = property
-    from yaml import SafeLoader
-
-    Protocol = object
-    runtime_checkable: Callable[..., Any]
-
     from typing_extensions import Literal
+    from yaml import SafeLoader
 
     def load_toml(path: Path) -> Dict[str, Any]: ...
 
 else:
-    try:
-        from typing import Protocol
-    except ImportError:
-        from typing_extensions import Protocol  # noqa
-    try:
-        from typing import runtime_checkable
-    except ImportError:
-        from typing_extensions import runtime_checkable  # noqa
     try:
         from yaml import CSafeLoader as SafeLoader
     except ImportError:  # pragma: no cover
         from yaml import SafeLoader
 
-    try:
-        from functools import cached_property
-    except ImportError:
-        _NOT_FOUND = object()
-
-        class cached_property:
-            def __init__(self, func: Callable) -> None:
-                self.func: Callable = func
-                self.__doc__: Any = func.__doc__
-
-            def __get__(self, instance: Any, owner: Any = None) -> Any:
-                value = instance.__dict__.get(self.func.__name__, _NOT_FOUND)
-                if value is _NOT_FOUND:  # pragma: no cover
-                    value = instance.__dict__[self.func.__name__] = self.func(instance)
-                return value
-
     try:
         import tomllib