Replace NamedTuple with dataclasses

Works around mypy bug python/mypy#7281.

Author: mattpap

bokeh/embed/bundle.py

@@ -22,6 +22,7 @@
 
 # Standard library imports
 import json
+from dataclasses import dataclass
 from os.path import (
     abspath,
     basename,
@@ -30,12 +31,7 @@
     join,
     normpath,
 )
-from typing import (
-    Dict,
-    List,
-    NamedTuple,
-    Optional,
-)
+from typing import Dict, List, Optional
 from warnings import warn
 
 # Bokeh imports
@@ -238,7 +234,8 @@ def _query_extensions(objs, query):
 
 _default_cdn_host = "https://unpkg.com"
 
-class ExtensionEmbed(NamedTuple):
+@dataclass
+class ExtensionEmbed:
     artifact_path: str
     server_url: str
     cdn_url: Optional[str] = None

bokeh/plotting/_tools.py

@@ -21,12 +21,12 @@
 import itertools
 import re
 import warnings
+from dataclasses import dataclass
 from typing import (
     Any,
     Dict,
     Iterator,
     List,
-    NamedTuple,
     Optional,
     Sequence,
     Tuple,
@@ -196,7 +196,8 @@ def _resolve_tools(tools: Union[str, Sequence[Union[Tool, str]]]) -> Tuple[List[
     return tool_objs, tool_map
 
 def _collect_repeated_tools(tool_objs: List[Tool]) -> Iterator[Tool]:
-    class Item(NamedTuple):
+    @dataclass
+    class Item:
         obj: Tool
         properties: Dict[str, Any]