fix: make typing compatible with 3.8

Author: roeap

object-store/object_store/__init__.py

@@ -1,7 +1,5 @@
-from __future__ import annotations
-
 from io import BytesIO
-from typing import List
+from typing import List, Optional, Union
 
 # NOTE aliasing the imports with 'as' makes them public in the eyes
 # of static code checkers. Thus we avoid listing them with __all__ = ...
@@ -13,12 +11,12 @@
 try:
     import importlib.metadata as importlib_metadata
 except ImportError:
-    import importlib_metadata
+    import importlib_metadata  # type: ignore
 
 __version__ = importlib_metadata.version("object-store-python")
 
-PathLike = str | List[str] | Path
-BytesLike = bytes | BytesIO
+PathLike = Union[str, List[str], Path]
+BytesLike = Union[bytes, BytesIO]
 
 DELIMITER = "/"
 
@@ -98,7 +96,7 @@ def delete(self, location: PathLike) -> None:
         """
         return super().delete(_as_path(location))
 
-    def list(self, prefix: PathLike | None = None) -> list[ObjectMeta]:
+    def list(self, prefix: Optional[PathLike] = None) -> list[ObjectMeta]:
         """List all the objects with the given prefix.
 
         Prefixes are evaluated on a path segment basis, i.e. `foo/bar/` is a prefix
@@ -113,7 +111,7 @@ def list(self, prefix: PathLike | None = None) -> list[ObjectMeta]:
         prefix_ = _as_path(prefix) if prefix else None
         return super().list(prefix_)
 
-    def list_with_delimiter(self, prefix: PathLike | None = None) -> ListResult:
+    def list_with_delimiter(self, prefix: Optional[PathLike] = None) -> ListResult:
         """List objects with the given prefix and an implementation specific
         delimiter. Returns common prefixes (directories) in addition to object
         metadata.

object-store/object_store/arrow.py

@@ -1,4 +1,4 @@
-from __future__ import annotations
+from typing import Dict, List, Optional
 
 import pyarrow as pa
 import pyarrow.fs as fs
@@ -10,16 +10,16 @@
 # _ArrowFileSystemHandler mus be the first element in the inherited classes, we need to also
 # inherit form fs.FileSystemHandler to pass pyarrow's type checks.
 class ArrowFileSystemHandler(_ArrowFileSystemHandler, fs.FileSystemHandler):
-    def open_input_file(self, path: str) -> pa.PythonFile:
+    def open_input_file(self, path: str) -> "pa.PythonFile":
         return pa.PythonFile(_ArrowFileSystemHandler.open_input_file(self, path))
 
-    def open_input_stream(self, path: str) -> pa.PythonFile:
+    def open_input_stream(self, path: str) -> "pa.PythonFile":
         return pa.PythonFile(_ArrowFileSystemHandler.open_input_file(self, path))
 
-    def open_output_stream(self, path: str, metadata: dict[str, str] | None = None) -> pa.PythonFile:
+    def open_output_stream(self, path: str, metadata: Optional[Dict[str, str]] = None) -> "pa.PythonFile":
         return pa.PythonFile(_ArrowFileSystemHandler.open_output_stream(self, path, metadata))
 
-    def get_file_info_selector(self, selector: fs.FileSelector) -> list[fs.FileInfo]:
+    def get_file_info_selector(self, selector: fs.FileSelector) -> List["fs.FileInfo"]:
         return _ArrowFileSystemHandler.get_file_info_selector(
             self, selector.base_dir, selector.allow_not_found, selector.recursive
         )