Add typing-extensions for proper TypedDict support

Also updated UnwrappedHistory to expose its types

packaging/setup.cfg

@@ -19,6 +19,7 @@ install_requires =
     grpcio>=1.12.0
     protobuf>=3.6.0
     yagrc>=1.1.1
+    typing-extensions>=4.3.0
 package_dir =
     =..
 py_modules =

requirements.txt

@@ -6,3 +6,4 @@ paho-mqtt>=1.5.1
 influxdb>=5.3.1
 influxdb_client>=1.23.0
 pypng>=0.0.20
+typing-extensions>=4.3.0

starlink_grpc.py

@@ -363,17 +363,8 @@ from itertools import chain
 import math
 import statistics
 from typing import Any, Dict, Iterable, List, Optional, Sequence, Tuple, get_type_hints
-try:
+from typing_extensions import TypedDict, get_args
-    from typing import TypedDict, get_args
+from xmlrpc.client import Boolean
-except ImportError:
-    # Python 3.7 does not have TypedDict, so fake it so the run time still
-    # works, even though static type checker probably will not.
-    def TypedDict(name, types):  # pylint: disable=invalid-name
-        return type(name, (dict,), {"__annotations__": types})
-
-    def get_args(tp: Any) -> Tuple[Any, ...]:
-        return tp.__args__
-
 
 import grpc
 
@@ -549,7 +540,10 @@ class GrpcError(Exception):
 
 
 class UnwrappedHistory:
-    """Empty class for holding a copy of grpc history data."""
+    """Class for holding a copy of grpc history data."""
+
+    unwrapped: bool
+    current: Any
 
 
 class ChannelContext:
@@ -1031,7 +1025,7 @@ def concatenate_history(history1, history2, samples1: int = -1, start1: Optional
             print("WARNING: Appending discontiguous samples. Polling interval probably too short.")
         new_samples = size2
 
-    unwrapped: Any = UnwrappedHistory()
+    unwrapped = UnwrappedHistory()
     for field in HISTORY_FIELDS:
         setattr(unwrapped, field, [])
     unwrapped.unwrapped = True