Update typing (#1150)

ipykernel/comm/comm.py

@@ -33,6 +33,7 @@ def publish_msg(self, msg_type, data=None, metadata=None, buffers=None, **keys):
         if self.kernel is None:
             self.kernel = Kernel.instance()
 
+        assert self.kernel.session is not None
         self.kernel.session.send(
             self.kernel.iopub_socket,
             msg_type,

ipykernel/datapub.py

@@ -48,6 +48,7 @@ def publish_data(self, data):
             The data to be published. Think of it as a namespace.
         """
         session = self.session
+        assert session is not None
         buffers = serialize_object(
             data,
             buffer_threshold=session.buffer_threshold,

ipykernel/displayhook.py

@@ -2,9 +2,11 @@
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
+from __future__ import annotations
 
 import builtins
 import sys
+import typing as t
 
 from IPython.core.displayhook import DisplayHook
 from jupyter_client.session import Session, extract_header
@@ -61,35 +63,39 @@ class ZMQShellDisplayHook(DisplayHook):
     session = Instance(Session, allow_none=True)
     pub_socket = Any(allow_none=True)
     parent_header = Dict({})
+    msg: dict[str, t.Any] | None
 
     def set_parent(self, parent):
         """Set the parent for outbound messages."""
         self.parent_header = extract_header(parent)
 
     def start_displayhook(self):
         """Start the display hook."""
-        self.msg = self.session.msg(
-            "execute_result",
-            {
-                "data": {},
-                "metadata": {},
-            },
-            parent=self.parent_header,
-        )
+        if self.session:
+            self.msg = self.session.msg(
+                "execute_result",
+                {
+                    "data": {},
+                    "metadata": {},
+                },
+                parent=self.parent_header,
+            )
 
     def write_output_prompt(self):
         """Write the output prompt."""
-        self.msg["content"]["execution_count"] = self.prompt_count
+        if self.msg:
+            self.msg["content"]["execution_count"] = self.prompt_count
 
     def write_format_data(self, format_dict, md_dict=None):
         """Write format data to the message."""
-        self.msg["content"]["data"] = json_clean(encode_images(format_dict))
-        self.msg["content"]["metadata"] = md_dict
+        if self.msg:
+            self.msg["content"]["data"] = json_clean(encode_images(format_dict))
+            self.msg["content"]["metadata"] = md_dict
 
     def finish_displayhook(self):
         """Finish up all displayhook activities."""
         sys.stdout.flush()
         sys.stderr.flush()
-        if self.msg["content"]["data"]:
+        if self.msg and self.msg["content"]["data"] and self.session:
             self.session.send(self.pub_socket, self.msg, ident=self.topic)
         self.msg = None

ipykernel/inprocess/client.py

@@ -60,42 +60,43 @@ def _default_blocking_class(self):
     def get_connection_info(self):
         """Get the connection info for the client."""
         d = super().get_connection_info()
-        d["kernel"] = self.kernel
+        d["kernel"] = self.kernel  # type:ignore[assignment]
         return d
 
     def start_channels(self, *args, **kwargs):
         """Start the channels on the client."""
         super().start_channels()
-        self.kernel.frontends.append(self)
+        if self.kernel:
+            self.kernel.frontends.append(self)
 
     @property
     def shell_channel(self):
         if self._shell_channel is None:
-            self._shell_channel = self.shell_channel_class(self)
+            self._shell_channel = self.shell_channel_class(self)  # type:ignore[operator]
         return self._shell_channel
 
     @property
     def iopub_channel(self):
         if self._iopub_channel is None:
-            self._iopub_channel = self.iopub_channel_class(self)
+            self._iopub_channel = self.iopub_channel_class(self)  # type:ignore[operator]
         return self._iopub_channel
 
     @property
     def stdin_channel(self):
         if self._stdin_channel is None:
-            self._stdin_channel = self.stdin_channel_class(self)
+            self._stdin_channel = self.stdin_channel_class(self)  # type:ignore[operator]
         return self._stdin_channel
 
     @property
     def control_channel(self):
         if self._control_channel is None:
-            self._control_channel = self.control_channel_class(self)
+            self._control_channel = self.control_channel_class(self)  # type:ignore[operator]
         return self._control_channel
 
     @property
     def hb_channel(self):
         if self._hb_channel is None:
-            self._hb_channel = self.hb_channel_class(self)
+            self._hb_channel = self.hb_channel_class(self)  # type:ignore[operator]
         return self._hb_channel
 
     # Methods for sending specific messages

ipykernel/inprocess/ipkernel.py

@@ -51,7 +51,7 @@ class InProcessKernel(IPythonKernel):
     _underlying_iopub_socket = Instance(DummySocket, ())
     iopub_thread: IOPubThread = Instance(IOPubThread)  # type:ignore[assignment]
 
-    shell_stream = Instance(DummySocket, ())
+    shell_stream = Instance(DummySocket, ())  # type:ignore[arg-type]
 
     @default("iopub_thread")
     def _default_iopub_thread(self):
@@ -72,7 +72,8 @@ def __init__(self, **traits):
         super().__init__(**traits)
 
         self._underlying_iopub_socket.observe(self._io_dispatch, names=["message_sent"])
-        self.shell.kernel = self
+        if self.shell:
+            self.shell.kernel = self
 
     async def execute_request(self, stream, ident, parent):
         """Override for temporary IO redirection."""
@@ -81,7 +82,8 @@ async def execute_request(self, stream, ident, parent):
 
     def start(self):
         """Override registration of dispatchers for streams."""
-        self.shell.exit_now = False
+        if self.shell:
+            self.shell.exit_now = False
 
     def _abort_queues(self):
         """The in-process kernel doesn't abort requests."""
@@ -99,6 +101,7 @@ def _input_request(self, prompt, ident, parent, password=False):
 
         # Send the input request.
         content = json_clean(dict(prompt=prompt, password=password))
+        assert self.session is not None
         msg = self.session.msg("input_request", content, parent)
         for frontend in self.frontends:
             if frontend.session.session == parent["header"]["session"]:
@@ -132,6 +135,7 @@ def _redirected_io(self):
     def _io_dispatch(self, change):
         """Called when a message is sent to the IO socket."""
         assert self.iopub_socket.io_thread is not None
+        assert self.session is not None
         ident, msg = self.session.recv(self.iopub_socket.io_thread.socket, copy=False)
         for frontend in self.frontends:
             frontend.iopub_channel.call_handlers(msg)

ipykernel/inprocess/manager.py

@@ -49,8 +49,9 @@ def start_kernel(self, **kwds):
 
     def shutdown_kernel(self):
         """Shutdown the kernel."""
-        self.kernel.iopub_thread.stop()
-        self._kill_kernel()
+        if self.kernel:
+            self.kernel.iopub_thread.stop()
+            self._kill_kernel()
 
     def restart_kernel(self, now=False, **kwds):
         """Restart the kernel."""

ipykernel/ipkernel.py

@@ -118,7 +118,7 @@ def __init__(self, **kwargs):
             )
 
         # Initialize the InteractiveShell subclass
-        self.shell = self.shell_class.instance(
+        self.shell = self.shell_class.instance(  # type:ignore[attr-defined]
             parent=self,
             profile_dir=self.profile_dir,
             user_module=self.user_module,
@@ -206,7 +206,8 @@ def dispatch_debugpy(self, msg):
 
     @property
     def banner(self):
-        return self.shell.banner
+        if self.shell:
+            return self.shell.banner
 
     async def poll_stopped_queue(self):
         """Poll the stopped queue."""
@@ -215,7 +216,8 @@ async def poll_stopped_queue(self):
 
     def start(self):
         """Start the kernel."""
-        self.shell.exit_now = False
+        if self.shell:
+            self.shell.exit_now = False
         if self.debugpy_stream is None:
             self.log.warning("debugpy_stream undefined, debugging will not be enabled")
         else:
@@ -231,7 +233,7 @@ def set_parent(self, ident, parent, channel="shell"):
         about the parent message.
         """
         super().set_parent(ident, parent, channel)
-        if channel == "shell":
+        if channel == "shell" and self.shell:
             self.shell.set_parent(parent)
 
     def init_metadata(self, parent):
@@ -284,7 +286,8 @@ def _restore_input(self):
 
     @property
     def execution_count(self):
-        return self.shell.execution_count
+        if self.shell:
+            return self.shell.execution_count
 
     @execution_count.setter
     def execution_count(self, value):
@@ -348,6 +351,7 @@ async def do_execute(
     ):
         """Handle code execution."""
         shell = self.shell  # we'll need this a lot here
+        assert shell is not None
 
         self._forward_input(allow_stdin)
 
@@ -371,7 +375,7 @@ async def run_cell(*args, **kwargs):
             # not just asyncio
             preprocessing_exc_tuple = None
             try:
-                transformed_cell = self.shell.transform_cell(code)
+                transformed_cell = shell.transform_cell(code)
             except Exception:
                 transformed_cell = code
                 preprocessing_exc_tuple = sys.exc_info()
@@ -488,6 +492,7 @@ def do_complete(self, code, cursor_pos):
             cursor_pos = len(code)
         line, offset = line_at_cursor(code, cursor_pos)
         line_cursor = cursor_pos - offset
+        assert self.shell is not None
         txt, matches = self.shell.complete("", line, line_cursor)
         return {
             "matches": matches,
@@ -509,6 +514,7 @@ def _experimental_do_complete(self, code, cursor_pos):
         if cursor_pos is None:
             cursor_pos = len(code)
         with _provisionalcompleter():
+            assert self.shell is not None
             raw_completions = self.shell.Completer.completions(code, cursor_pos)
             completions = list(_rectify_completions(code, raw_completions))
 
@@ -548,6 +554,7 @@ def do_inspect(self, code, cursor_pos, detail_level=0, omit_sections=()):
         reply_content: t.Dict[str, t.Any] = {"status": "ok"}
         reply_content["data"] = {}
         reply_content["metadata"] = {}
+        assert self.shell is not None
         try:
             if release.version_info >= (8,):
                 # `omit_sections` keyword will be available in IPython 8, see
@@ -581,6 +588,7 @@ def do_history(
         unique=False,
     ):
         """Handle code history."""
+        assert self.shell is not None
         if hist_access_type == "tail":
             hist = self.shell.history_manager.get_tail(
                 n, raw=raw, output=output, include_latest=True
@@ -605,14 +613,16 @@ def do_history(
 
     def do_shutdown(self, restart):
         """Handle kernel shutdown."""
-        self.shell.exit_now = True
+        if self.shell:
+            self.shell.exit_now = True
         return dict(status="ok", restart=restart)
 
     def do_is_complete(self, code):
         """Handle an is_complete request."""
         transformer_manager = getattr(self.shell, "input_transformer_manager", None)
         if transformer_manager is None:
             # input_splitter attribute is deprecated
+            assert self.shell is not None
             transformer_manager = self.shell.input_splitter
         status, indent_spaces = transformer_manager.check_complete(code)
         r = {"status": status}
@@ -628,6 +638,7 @@ def do_apply(self, content, bufs, msg_id, reply_metadata):
             from .serialize import serialize_object, unpack_apply_message
 
         shell = self.shell
+        assert shell is not None
         try:
             working = shell.user_ns
 
@@ -652,6 +663,7 @@ def do_apply(self, content, bufs, msg_id, reply_metadata):
                 for key in ns:
                     working.pop(key)
 
+            assert self.session is not None
             result_buf = serialize_object(
                 result,
                 buffer_threshold=self.session.buffer_threshold,
@@ -686,7 +698,8 @@ def do_apply(self, content, bufs, msg_id, reply_metadata):
 
     def do_clear(self):
         """Clear the kernel."""
-        self.shell.reset(False)
+        if self.shell:
+            self.shell.reset(False)
         return dict(status="ok")
 
 

ipykernel/kernelapp.py

@@ -547,7 +547,7 @@ def init_kernel(self):
         control_stream = ZMQStream(self.control_socket, self.control_thread.io_loop)
         debugpy_stream = ZMQStream(self.debugpy_socket, self.control_thread.io_loop)
         self.control_thread.start()
-        kernel_factory = self.kernel_class.instance
+        kernel_factory = self.kernel_class.instance  # type:ignore[attr-defined]
 
         kernel = kernel_factory(
             parent=self,