fix: Python 3.7 typing imports (#108)

Per issue #57 , fix typing imports in Python 3.7.

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.4
+
+* Python-3.7 compat
+
 ## 0.3.3
 
 * Removes BasicConfig from logger configuration

unstructured/__version__.py

@@ -1 +1 @@
-__version__ = "0.3.3"  # pragma: no cover
+__version__ = "0.3.4"  # pragma: no cover

unstructured/partition/email.py

@@ -1,5 +1,11 @@
 import email
-from typing import Dict, Final, IO, List, Optional
+import sys
+from typing import Dict, IO, List, Optional
+
+if sys.version_info < (3, 8):
+    from typing_extensions import Final
+else:
+    from typing import Final
 
 from unstructured.cleaners.core import replace_mime_encodings
 from unstructured.documents.elements import Element, Text

unstructured/partition/pdf.py

@@ -1,18 +1,5 @@
 import requests  # type: ignore
-
-import sys
-
-if sys.version_info < (3, 8):
-    from typing_extensions import (
-        List,
-        Optional,
-        Union,
-        Tuple,
-        Mapping,
-        BinaryIO,
-    )  # pragma: no cover
-else:
-    from typing import List, Optional, Union, Tuple, Mapping, BinaryIO  # pragma: no cover
+from typing import BinaryIO, List, Optional, Union, Tuple, Mapping
 
 from unstructured.documents.elements import Element
 

unstructured/partition/text_type.py

@@ -1,10 +1,12 @@
 """partition.py implements logic for partitioning plain text documents into sections."""
 import sys
 
+from typing import List, Optional
+
 if sys.version_info < (3, 8):
-    from typing_extensions import Final, List, Optional
+    from typing_extensions import Final
 else:
-    from typing import Final, List, Optional
+    from typing import Final
 
 from unstructured.cleaners.core import remove_punctuation
 from unstructured.nlp.patterns import UNICODE_BULLETS_RE