Add 3.10 Self fallback

tivars/flash.py

@@ -4,7 +4,8 @@
 
 
 from io import BytesIO
-from typing import BinaryIO, Self, Type
+from sys import version_info
+from typing import BinaryIO, Type
 from warnings import warn
 
 from .data import *
@@ -13,6 +14,14 @@
 from .numeric import BCD
 
 
+match version_info[:2]:
+    case 3, 10:
+        Self = 'TIFlashHeader'
+
+    case _:
+        from typing import Self
+
+
 class DeviceType(Enum):
     """
     Enum of flash device types
@@ -547,7 +556,7 @@ def checksum(self) -> bytes:
         return self.raw.checksum
 
     @classmethod
-    def get_type(cls, type_id: int) -> Type['TIFlashHeader']:
+    def get_type(cls, type_id: int) -> Type['TIFlashHeader'] | None:
         """
         Gets the subclass corresponding to a type ID if one is registered
 

tivars/var.py

@@ -4,14 +4,23 @@
 
 
 from io import BytesIO
-from typing import BinaryIO, Iterator, Self, Type
+from sys import version_info
+from typing import BinaryIO, Iterator, Type
 from warnings import warn
 
 from .data import *
 from .models import *
 from .tokenizer import TokenizedString
 
 
+match version_info[:2]:
+    case 3, 10:
+        Self = 'TIEntry'
+
+    case _:
+        from typing import Self
+
+
 class TIHeader:
     """
     Parser for var file headers
@@ -552,7 +561,7 @@ def meta(self) -> bytes:
         return self.raw.calc_data_length + self.raw.type_id + self.raw.name + self.raw.version + self.raw.archived
 
     @classmethod
-    def get_type(cls, type_id: int) -> Type['TIEntry']:
+    def get_type(cls, type_id: int) -> Type['TIEntry'] | None:
         """
         Gets the subclass corresponding to a type ID if one is registered