AttributeError: 'NoneType' object has no attribute 'start'
kostrykin opened this issue · 1 comments
kostrykin commented
I have installed nbterm 0.0.13 using pip.
I have a notebook test.ipynb which consists of a single cell (1+1).
I am trying to run the notebook in batch mode using nbterm --run test.ipynb which gives the following error:
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ /private/tmp/test/env/lib/python3.9/site-packages/nbterm/nbterm.py:73 in main │
│ │
│ 70 │ ) │
│ 71 │ if run: │
│ 72 │ │ assert no_kernel is not True │
│ ❱ 73 │ │ asyncio.run(nb.run_all()) │
│ 74 │ │ if save_path is None: │
│ 75 │ │ │ directory = notebook_path.parent │
│ 76 │ │ │ prefix = str(directory / f"{notebook_path.stem}_run") │
│ │
│ ╭───────────────────────────── locals ─────────────────────────────╮ │
│ │ kernel_cwd = PosixPath('.') │ │
│ │ nb = <nbterm.notebook.Notebook object at 0x102216460> │ │
│ │ no_kernel = None │ │
│ │ notebook_path = PosixPath('test.ipynb') │ │
│ │ prefix = 'Untitled' │ │
│ │ run = True │ │
│ │ save_path = None │ │
│ │ test = None │ │
│ │ version = None │ │
│ ╰──────────────────────────────────────────────────────────────────╯ │
│ │
│ /opt/homebrew/Caskroom/miniforge/base/envs/kostrykin2021-m1/lib/python3.9/asyncio/runners.py:44 │
│ in run │
│ │
│ 41 │ │ events.set_event_loop(loop) │
│ 42 │ │ if debug is not None: │
│ 43 │ │ │ loop.set_debug(debug) │
│ ❱ 44 │ │ return loop.run_until_complete(main) │
│ 45 │ finally: │
│ 46 │ │ try: │
│ 47 │ │ │ _cancel_all_tasks(loop) │
│ │
│ ╭──────────────────────────────── locals ────────────────────────────────╮ │
│ │ debug = None │ │
│ │ loop = <_UnixSelectorEventLoop running=False closed=True debug=False> │ │
│ │ main = <coroutine object Notebook.run_all at 0x1021f6ac0> │ │
│ ╰────────────────────────────────────────────────────────────────────────╯ │
│ │
│ /opt/homebrew/Caskroom/miniforge/base/envs/kostrykin2021-m1/lib/python3.9/asyncio/base_events.py │
│ :642 in run_until_complete │
│ │
│ 639 │ │ if not future.done(): │
│ 640 │ │ │ raise RuntimeError('Event loop stopped before Future completed.') │
│ 641 │ │ │
│ ❱ 642 │ │ return future.result() │
│ 643 │ │
│ 644 │ def stop(self): │
│ 645 │ │ """Stop running the event loop. │
│ │
│ ╭─────────────────────────────────────────── locals ───────────────────────────────────────────╮ │
│ │ future = <Task finished name='Task-1' coro=<Notebook.run_all() done, defined at │ │
│ │ /private/tmp/test/env/lib/python3.9/site-packages/nbterm/notebook.py:117> │ │
│ │ exception=AttributeError("'NoneType' object has no attribute 'start'")> │ │
│ │ new_task = True │ │
│ │ self = <_UnixSelectorEventLoop running=False closed=True debug=False> │ │
│ ╰──────────────────────────────────────────────────────────────────────────────────────────────╯ │
│ │
│ /private/tmp/test/env/lib/python3.9/site-packages/nbterm/notebook.py:118 in run_all │
│ │
│ 115 │ │ await self.current_cell.run() │
│ 116 │ │
│ 117 │ async def run_all(self): │
│ ❱ 118 │ │ await self.kd.start() │
│ 119 │ │ for i in range(len(self.cells)): │
│ 120 │ │ │ await self.run_cell(i) │
│ 121 │
│ │
│ ╭──────────────────────── locals ─────────────────────────╮ │
│ │ self = <nbterm.notebook.Notebook object at 0x102216460> │ │
│ ╰─────────────────────────────────────────────────────────╯ │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
AttributeError: 'NoneType' object has no attribute 'start'
Why isn't this working as expected and what does the error mean?
davidbrochart commented
Assuming the code you want to execute is written in Python, you need to install a Python kernel. You can e.g.:
pip install ipykernel