typing extension on 3.10 before

IPython/core/oinspect.py

@@ -53,8 +53,9 @@
 from pygments.lexers import PythonLexer
 from pygments.formatters import HtmlFormatter
 
-UnformattedBundle: TypeAlias = Dict[str, List[Tuple[str, str]]]
-Bundle: TypeAlias = Dict[str, List[str]]
+
+UnformattedBundle: TypeAlias = Dict[str, List[Tuple[str, str]]]  # List of (title, body)
+Bundle: TypeAlias = Dict[str, str]
 
 
 @dataclass
@@ -577,27 +578,37 @@ def format_mime(self, bundle: UnformattedBundle) -> Bundle:
         assert isinstance(bundle["text/plain"], list)
         for item in bundle["text/plain"]:
             assert isinstance(item, tuple)
-        if isinstance(bundle["text/plain"], (list, tuple)):
-            # bundle['text/plain'] is a list of (head, formatted body) pairs
-            lines = []
-            _len = max(len(h) for h, _ in bundle["text/plain"])
-
-            for head, body in bundle["text/plain"]:
-                body = body.strip("\n")
-                delim = "\n" if "\n" in body else " "
-                lines.append(
-                    f"{self.__head(head+':')}{(_len - len(head))*' '}{delim}{body}"
-                )
 
-            bundle["text/plain"] = "\n".join(lines)
+        new_b: Bundle = {}
+        lines = []
+        _len = max(len(h) for h, _ in bundle["text/plain"])
 
-        # Format the text/html mimetype
-        if isinstance(bundle["text/html"], (list, tuple)):
-            # bundle['text/html'] is a list of (head, formatted body) pairs
-            bundle["text/html"] = "\n".join(
-                (f"<h1>{head}</h1>\n{body}" for (head, body) in bundle["text/html"])
+        for head, body in bundle["text/plain"]:
+            body = body.strip("\n")
+            delim = "\n" if "\n" in body else " "
+            lines.append(
+                f"{self.__head(head+':')}{(_len - len(head))*' '}{delim}{body}"
             )
-        return bundle
+
+        new_b["text/plain"] = "\n".join(lines)
+
+        if "text/html" in bundle:
+            assert isinstance(bundle["text/html"], list)
+            for item in bundle["text/html"]:
+                assert isinstance(item, tuple)
+            # Format the text/html mimetype
+            if isinstance(bundle["text/html"], (list, tuple)):
+                # bundle['text/html'] is a list of (head, formatted body) pairs
+                new_b["text/html"] = "\n".join(
+                    (f"<h1>{head}</h1>\n{body}" for (head, body) in bundle["text/html"])
+                )
+
+        for k in bundle.keys():
+            if k in ("text/html", "text/plain"):
+                continue
+            else:
+                new_b = bundle[k]  # type:ignore
+        return new_b
 
     def _append_info_field(
         self,

setup.cfg

@@ -41,6 +41,7 @@ install_requires =
     pygments>=2.4.0
     stack_data
     traitlets>=5
+    typing_extensions ; python_version<'3.10'"
 
 [options.extras_require]
 black =
@@ -54,7 +55,6 @@ doc =
     matplotlib
     stack_data
     pytest<7
-    typing_extensions
     %(test)s
 kernel =
     ipykernel