finally done with type hinting issues between python versions?

Author: wolph

python_utils/containers.py

@@ -22,8 +22,6 @@
     '_typeshed.SupportsKeysAndGetItem[KT, VT]',
 ]
 
-OnDuplicate: types.Literal['raise', 'ignore']
-
 
 class CastedDictBase(types.Dict[KT, VT], abc.ABC):
     _key_cast: KT_cast
@@ -211,7 +209,11 @@ class UniqueList(types.List[VT]):
 
     _set: set[VT]
 
-    def __init__(self, *args: VT, on_duplicate: OnDuplicate = 'ignore'):
+    def __init__(
+        self,
+        *args: VT,
+        on_duplicate: types.Literal['raise', 'ignore'] = 'ignore'
+    ):
         self.on_duplicate = on_duplicate
         self._set = set()
         super().__init__()

python_utils/types.py

@@ -1,13 +1,14 @@
 import datetime
 import decimal
+import sys
 from typing import *  # type: ignore # pragma: no cover
 
 # import * does not import Pattern
 from typing import Pattern
 
-try:
-    from typing import Literal, SupportsIndex  # type: ignore
-except ImportError:
+if sys.version_info >= (3, 8):  # pragma: no cover
+    from typing import Literal, SupportsIndex
+else:  # pragma: no cover
     from typing_extensions import Literal, SupportsIndex
 
 # Quickhand for optional because it gets so much use. If only Python had
@@ -38,9 +39,9 @@
     None,
 ]
 
-assert Pattern  # type: ignore
-assert Literal
-assert SupportsIndex
+assert Pattern is not None  # type: ignore
+assert Literal is not None
+assert SupportsIndex is not None
 
 __all__ = [
     'OptionalScope',

setup.py

@@ -14,8 +14,6 @@
 else:
     long_description = 'See http://pypi.python.org/pypi/python-utils/'
 
-install_requires = []
-
 if __name__ == '__main__':
     setuptools.setup(
         python_requires='>3.6.0',