Fix return type of classmethod parse (python-semver#396)

def- · web-flow · commit 6176316e49c5 · 2023-02-28T08:04:52.000+01:00
So that calling parse on a derived class will show correct type of
derived class
diff --git a/src/semver/version.py b/src/semver/version.py
@@ -14,6 +14,8 @@
     cast,
     Callable,
     Collection,
+    Type,
+    TypeVar,
 )
 
 from ._types import (
@@ -28,6 +30,8 @@
 Comparable = Union["Version", Dict[str, VersionPart], Collection[VersionPart], str]
 Comparator = Callable[["Version", Comparable], bool]
 
+T = TypeVar("T", bound="Version")
+
 
 def _comparator(operator: Comparator) -> Comparator:
     """Wrap a Version binary op method in a type-check."""
@@ -571,8 +575,8 @@ def match(self, match_expr: str) -> bool:
 
     @classmethod
     def parse(
-        cls, version: String, optional_minor_and_patch: bool = False
-    ) -> "Version":
+        cls: Type[T], version: String, optional_minor_and_patch: bool = False
+    ) -> T:
         """
         Parse version string to a Version instance.
 
