Use __new__ for datetime.time (#5530)

CONTRIBUTING.md

@@ -274,13 +274,13 @@ MAXYEAR: int
 MINYEAR: int
 
 class date:
-    def __init__(self, year: int, month: int, day: int) -> None: ...
+    def __new__(cls: Type[_S], year: int, month: int, day: int) -> _S: ...
     @classmethod
-    def fromtimestamp(cls, timestamp: float) -> date: ...
+    def fromtimestamp(cls: Type[_S], __timestamp: float) -> _S: ...
     @classmethod
-    def today(cls) -> date: ...
+    def today(cls: Type[_S]) -> _S: ...
     @classmethod
-    def fromordinal(cls, ordinal: int) -> date: ...
+    def fromordinal(cls: Type[_S], n: int) -> _S: ...
     @property
     def year(self) -> int: ...
     def replace(self, year: int = ..., month: int = ..., day: int = ...) -> date: ...

stdlib/@python2/datetime.pyi

@@ -59,9 +59,14 @@ class time:
     min: ClassVar[time]
     max: ClassVar[time]
     resolution: ClassVar[timedelta]
-    def __init__(
-        self, hour: int = ..., minute: int = ..., second: int = ..., microsecond: int = ..., tzinfo: Optional[_tzinfo] = ...
-    ) -> None: ...
+    def __new__(
+        cls: Type[_S],
+        hour: int = ...,
+        minute: int = ...,
+        second: int = ...,
+        microsecond: int = ...,
+        tzinfo: Optional[_tzinfo] = ...,
+    ) -> _S: ...
     @property
     def hour(self) -> int: ...
     @property

stdlib/datetime.pyi

@@ -85,8 +85,8 @@ class time:
     min: ClassVar[time]
     max: ClassVar[time]
     resolution: ClassVar[timedelta]
-    def __init__(
-        self,
+    def __new__(
+        cls: Type[_S],
         hour: int = ...,
         minute: int = ...,
         second: int = ...,
@@ -94,7 +94,7 @@ class time:
         tzinfo: Optional[_tzinfo] = ...,
         *,
         fold: int = ...,
-    ) -> None: ...
+    ) -> _S: ...
     @property
     def hour(self) -> int: ...
     @property