Update Python version in workflows and add typing features

* Updated `pylint.yml` workflow file to use only Python versions 3.8+
* Added support for TypedDict and Literal types in `__init__.py` (Python 3.9+)
* Fall back to using `typing_extensions` for older Python versions

This commit ensures that our code is compatible with the latest Python versions while still supporting older versions.

.github/workflows/pylint.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.8", "3.9", "3.10"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}

cambai/__init__.py

@@ -3,19 +3,18 @@
 import math
 import json
 from time import sleep
-from typing import Optional
+from typing import Optional, Literal, TypedDict
 from enum import IntEnum
 import requests
 from rich import print
 from tqdm import tqdm
 
-if sys.version_info >= (3, 8):
-    # Python 3.8+ supports the built-in TypedDict and Literal types
-    from typing import Literal, TypedDict
-else:
-    from typing_extensions import Literal, TypedDict
+# Check the Python version at runtime
+if sys.version_info < (3, 9):
+    # For Python versions less than 3.9, import Literal and TypedDict from typing_extensions
     from typing import List as list
 
+
 class APIKeyMissingError(Exception):
     """Exception raised when the API Key is missing."""