typing Literal fallback

adafruit_rsa/_compat.py

@@ -14,10 +14,16 @@
 from struct import pack
 
 try:
-    from typing import Any, Literal, Tuple
+    from typing import Any, Tuple
+
+    try:
+        from typing import Literal
+    except ImportError:
+        from typing_extensions import Literal
 except ImportError:
     pass
 
+
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_RSA.git"
 

adafruit_rsa/key.py

@@ -35,7 +35,12 @@
 import adafruit_rsa.core
 
 try:
-    from typing import Any, Tuple, Dict, Callable, Literal
+    from typing import Any, Tuple, Dict, Callable
+
+    try:
+        from typing import Literal
+    except ImportError:
+        from typing_extensions import Literal
 except ImportError:
     pass
 

adafruit_rsa/machine_size.py

@@ -13,7 +13,12 @@
 import sys
 
 try:
-    from typing import Literal, Tuple
+    from typing import Tuple
+
+    try:
+        from typing import Literal
+    except ImportError:
+        from typing_extensions import Literal
 except ImportError:
     pass
 

adafruit_rsa/pkcs1.py

@@ -26,14 +26,19 @@
 from adafruit_rsa import common, transform, core
 
 try:
-    from typing import Optional, Iterator, Union, Literal
+    from typing import Optional, Iterator, Union
     from adafruit_rsa.key import PublicKey, PrivateKey
 
     try:
         from typing import Protocol
     except ImportError:
         from typing_extensions import Protocol
 
+    try:
+        from typing import Literal
+    except ImportError:
+        from typing_extensions import Literal
+
     class _FileLikeObject(Protocol):
         """A file like object that implements the :meth:`read` method"""
 

adafruit_rsa/prime.py

@@ -17,7 +17,10 @@
 import adafruit_rsa.randnum
 
 try:
-    from typing import Literal
+    try:
+        from typing import Literal
+    except ImportError:
+        from typing_extensions import Literal
 except ImportError:
     pass