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"""A simple echo kernel."""
# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
from __future__ import annotations
import logging
import typing
# mypy: disable-error-code="no-untyped-call"
from ipykernel.kernelapp import IPKernelApp
from ipykernel.kernelbase import Kernel
class EchoKernel(Kernel):
"""An echo kernel."""
implementation = "Echo"
implementation_version = "1.0"
language = "echo"
language_version = "0.1"
language_info = {
"name": "echo",
"mimetype": "text/plain",
"file_extension": ".txt",
}
banner = "Echo kernel - as useful as a parrot"
def do_execute( # type:ignore[override]
self,
code: str,
silent: bool,
store_history=True, # noqa: ARG002
user_expressions: typing.Any = None, # noqa: ARG002
allow_stdin=False,
*,
cell_id: str | None = None, # noqa: ARG002
) -> dict[str, typing.Any]:
"""Execute code on the kernel."""
if not silent:
stream_content = {"name": "stdout", "text": code}
self.send_response(self.iopub_socket, "stream", stream_content)
# Send a input_request if code contains input command.
if allow_stdin and code and code.find("input(") != -1:
self._input_request(
"Echo Prompt",
self._parent_ident["shell"],
self.get_parent(channel="shell"),
password=False,
)
return {
"status": "ok",
# The base class increments the execution count
"execution_count": self.execution_count,
"payload": [],
"user_expressions": {},
}
class EchoKernelApp(IPKernelApp):
"""An app for the echo kernel."""
kernel_class = EchoKernel # type:ignore[assignment]
if __name__ == "__main__":
logging.disable(logging.ERROR)
EchoKernelApp.launch_instance()
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