add SupportsIndex to IterableList, with version import guards

Author: Yobmod

git/types.py

@@ -7,15 +7,12 @@
 from typing import Union, Any
 
 if sys.version_info[:2] >= (3, 8):
-    from typing import Final, Literal  # noqa: F401
+    from typing import Final, Literal, SupportsIndex  # noqa: F401
 else:
-    from typing_extensions import Final, Literal  # noqa: F401
+    from typing_extensions import Final, Literal, SupportsIndex  # noqa: F401
 
 
-if sys.version_info[:2] < (3, 6):
-    # os.PathLike (PEP-519) only got introduced with Python 3.6
-    PathLike = str
-elif sys.version_info[:2] < (3, 9):
+if sys.version_info[:2] < (3, 9):
     # Python >= 3.6, < 3.9
     PathLike = Union[str, os.PathLike]
 elif sys.version_info[:2] >= (3, 9):

git/util.py

@@ -29,7 +29,7 @@
 if TYPE_CHECKING:
     from git.remote import Remote
     from git.repo.base import Repo
-from .types import PathLike, TBD, Literal
+from .types import PathLike, TBD, Literal, SupportsIndex
 
 # ---------------------------------------------------------------------
 
@@ -971,7 +971,10 @@ def __getattr__(self, attr: str) -> Any:
         # END for each item
         return list.__getattribute__(self, attr)
 
-    def __getitem__(self, index: Union[int, slice, str]) -> Any:   # type: ignore
+    def __getitem__(self, index: Union[SupportsIndex, int, slice, str]) -> Any:
+
+        assert isinstance(index, (int, str, slice)), "Index of IterableList should be an int or str"
+
         if isinstance(index, int):
             return list.__getitem__(self, index)
         elif isinstance(index, slice):
@@ -983,12 +986,13 @@ def __getitem__(self, index: Union[int, slice, str]) -> Any:   # type: ignore
                 raise IndexError("No item found with id %r" % (self._prefix + index)) from e
         # END handle getattr
 
-    def __delitem__(self, index: Union[int, str, slice]) -> None:      # type: ignore
+    def __delitem__(self, index: Union[SupportsIndex, int, slice, str]) -> Any:
+
+        assert isinstance(index, (int, str)), "Index of IterableList should be an int or str"
 
         delindex = cast(int, index)
         if not isinstance(index, int):
             delindex = -1
-            assert not isinstance(index, slice)
             name = self._prefix + index
             for i, item in enumerate(self):
                 if getattr(item, self._id_attr) == name: