Refine types for distutils.version

stdlib/2and3/distutils/version.pyi

@@ -1,31 +1,54 @@
 import sys
-from typing import Any
+from abc import abstractmethod
+from typing import Any, Optional, TypeVar, Union, Pattern, Tuple
+
+_T = TypeVar('_T', bound='Version')
 
 class Version:
-    def __init__(self, vstring=None): ...
+    def __repr__(self) -> str: ...
+
+    if sys.version_info >= (3,):
+        def __eq__(self, other: object) -> bool: ...
+        def __lt__(self: _T, other: Union[_T, str]) -> bool: ...
+        def __le__(self: _T, other: Union[_T, str]) -> bool: ...
+        def __gt__(self: _T, other: Union[_T, str]) -> bool: ...
+        def __ge__(self: _T, other: Union[_T, str]) -> bool: ...
 
+    @abstractmethod
+    def __init__(self, vstring: Optional[str] = ...) -> None: ...
+    @abstractmethod
+    def parse(self: _T, vstring: str) -> _T: ...
+    @abstractmethod
+    def __str__(self) -> str: ...
     if sys.version_info >= (3,):
-        def __eq__(self, other): ...
-        def __lt__(self, other): ...
-        def __le__(self, other): ...
-        def __gt__(self, other): ...
-        def __ge__(self, other): ...
+        @abstractmethod
+        def _cmp(self: _T, other: Union[_T, str]) -> bool: ...
+    else:
+        @abstractmethod
+        def __cmp__(self: _T, other: Union[_T, str]) -> bool: ...
 
 class StrictVersion(Version):
-    version_re = ...  # type: Any
-    version = ...  # type: Any
-    prerelease = ...  # type: Any
-    def parse(self, vstring): ...
+    version_re: Pattern[str]
+    version: Tuple[int, int, int]
+    prerelease: Optional[Tuple[str, int]]
 
-    if sys.version_info < (3,):
-        def __cmp__(self, other): ...
+    def __init__(self, vstring: Optional[str] = ...) -> None: ...
+    def parse(self: _T, vstring: str) -> _T: ...
+    def __str__(self) -> str: ...
+    if sys.version_info >= (3,):
+        def _cmp(self: _T, other: Union[_T, str]) -> bool: ...
+    else:
+        def __cmp__(self: _T, other: Union[_T, str]) -> bool: ...
 
 class LooseVersion(Version):
-    component_re = ...  # type: Any
-    def __init__(self, vstring=None): ...
-    vstring = ...  # type: Any
-    version = ...  # type: Any
-    def parse(self, vstring): ...
-
-    if sys.version_info < (3,):
-        def __cmp__(self, other): ...
+    component_re: Pattern[str]
+    vstring: str
+    version: Tuple[Union[str, int], ...]
+
+    def __init__(self, vstring: Optional[str] = ...) -> None: ...
+    def parse(self: _T, vstring: str) -> _T: ...
+    def __str__(self) -> str: ...
+    if sys.version_info >= (3,):
+        def _cmp(self: _T, other: Union[_T, str]) -> bool: ...
+    else:
+        def __cmp__(self: _T, other: Union[_T, str]) -> bool: ...