fix: correct file not found error (#171)

* fix: correct file not found error

* fix: allow load binary to recieve path

docarray/array/mixins/io/binary.py

@@ -4,6 +4,7 @@
 import os
 import pickle
 from contextlib import nullcontext
+from pathlib import Path
 from typing import Union, BinaryIO, TYPE_CHECKING, Type, Optional, Generator
 
 from ....helper import (
@@ -24,7 +25,7 @@ class BinaryIOMixin:
     @classmethod
     def load_binary(
         cls: Type['T'],
-        file: Union[str, BinaryIO, bytes],
+        file: Union[str, BinaryIO, bytes, Path],
         protocol: str = 'pickle-array',
         compress: Optional[str] = None,
         _show_progress: bool = False,
@@ -54,13 +55,14 @@ def load_binary(
             file_ctx = nullcontext(file)
         elif isinstance(file, bytes):
             file_ctx = nullcontext(file)
+        # by checking path existence we allow file to be of type Path, LocalPath, PurePath and str
         elif os.path.exists(file):
             protocol, compress = protocol_and_compress_from_file_path(
                 file, protocol, compress
             )
             file_ctx = open(file, 'rb')
         else:
-            raise ValueError(f'unsupported input {file!r}')
+            raise FileNotFoundError(f'cannot find file {file}')
         if streaming:
             return cls._load_binary_stream(
                 file_ctx,

tests/unit/array/test_from_to_bytes.py

@@ -93,6 +93,11 @@ def test_from_to_protobuf(target_da):
     DocumentArray.from_protobuf(target_da.to_protobuf())
 
 
+def test_non_existing_file_raises_file_not_found_error():
+    with pytest.raises(FileNotFoundError):
+        DocumentArray.load_binary('file_does_not_exists.bin')
+
+
 @pytest.mark.parametrize('target', [DocumentArray.empty(10), random_docs(10)])
 @pytest.mark.parametrize('protocol', ['jsonschema', 'protobuf'])
 @pytest.mark.parametrize('to_fn', ['dict', 'json'])