Day 65 (Solution) Jupyter notebook does not work with Kernel Not Conected.

Install jupyter notebook

pip install jupyter → Completed quickly, the web version of jupyter started with jupyter notebook, if you think it's okay ...

The movement is strange.

In but not out. Even Markdown remains in plain text. Eventually, the kernel got an error and became Not Conected.

What does that mean?

Take a look at the log

Immediately after the first Kernel started:, Traceback (most recent call last): runs and ends with ModuleNotFoundError: No module named'prompt_toolkit.formatted_text'.

[I 13:44:36.598 NotebookApp] Kernel started: 2b1f107e-6695-4f99-bf66-37f048436327
Traceback (most recent call last):
  File "/anaconda3/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/anaconda3/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/anaconda3/lib/python3.6/site-packages/ipykernel_launcher.py", line 15, in <module>
    from ipykernel import kernelapp as app
  File "/anaconda3/lib/python3.6/site-packages/ipykernel/__init__.py", line 2, in <module>
    from .connect import *
  File "/anaconda3/lib/python3.6/site-packages/ipykernel/connect.py", line 13, in <module>
    from IPython.core.profiledir import ProfileDir
  File "/anaconda3/lib/python3.6/site-packages/IPython/__init__.py", line 56, in <module>
    from .terminal.embed import embed
  File "/anaconda3/lib/python3.6/site-packages/IPython/terminal/embed.py", line 16, in <module>
    from IPython.terminal.interactiveshell import TerminalInteractiveShell
  File "/anaconda3/lib/python3.6/site-packages/IPython/terminal/interactiveshell.py", line 21, in <module>
    from prompt_toolkit.formatted_text import PygmentsTokens
ModuleNotFoundError: No module named 'prompt_toolkit.formatted_text'
[I 13:44:39.584 NotebookApp] KernelRestarter: restarting kernel (1/5), new random ports
Traceback (most recent call last):

After that, I restarted several times with Kernel Restarter: restarting kernel (1/5), but all of them ended with ModuleNotFoundError.

What is prompt-toolkit?

It looks like a drawing tool. A note about the introduction and operation of the python prompt toolkit https://vaaaaaanquish.hatenablog.com/entry/2019/07/06/213909

Is it installed?

$ pip list | grep prompt-toolkit
  prompt-toolkit                     1.0.18

is there.

What is the latest version?

prompt-toolkit 3.0.2 https://pypi.org/project/prompt-toolkit/

1.0 and 3.0 would be quite different.

Is there prompt_toolkit.formatted_text?

It doesn't seem to be 1.0.

https://python-prompt-toolkit.readthedocs.io/en/1.0.15/search.html?q=formatted_text&check_keywords=yes&area=default

It's in 2.0.

https://python-prompt-toolkit.readthedocs.io/en/latest/index.html

It has increased in 3.0.

https://python-prompt-toolkit.readthedocs.io/en/master/index.html

That means it would be nice to upgrade to 2.0!

Immediately.

$ pip install --upgrade prompt-toolkit==2
ERROR: Could not find a version that satisfies the requirement prompt-toolkit==2 (from versions: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.25, 0.26, 0.28, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.0.10, 1.0.13, 1.0.14, 1.0.15, 1.0.16, 1.0.17, 1.0.18, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.0.10, 3.0.0, 3.0.1, 3.0.2)
ERROR: No matching distribution found for prompt-toolkit==2

It seems that you have to specify the decimal point firmly. Is it okay with the final version of the 2nd series?

$ pip install --upgrade prompt-toolkit==2.0.10
Collecting prompt-toolkit==2.0.10
  Downloading https://files.pythonhosted.org/packages/87/61/2dfea88583d5454e3a64f9308a686071d58d59a55db638268a6413e1eb6d/prompt_toolkit-2.0.10-py3-none-any.whl (340kB)
     |████████████████████████████████| 348kB 1.4MB/s 
Requirement already satisfied, skipping upgrade: six>=1.9.0 in /anaconda3/lib/python3.6/site-packages (from prompt-toolkit==2.0.10) (1.13.0)
Requirement already satisfied, skipping upgrade: wcwidth in /anaconda3/lib/python3.6/site-packages (from prompt-toolkit==2.0.10) (0.1.7)
ERROR: jupyter-console 5.2.0 has requirement prompt-toolkit<2.0.0,>=1.0.0, but you'll have prompt-toolkit 2.0.10 which is incompatible.
Installing collected packages: prompt-toolkit
  Found existing installation: prompt-toolkit 1.0.18
    Uninstalling prompt-toolkit-1.0.18:
      Successfully uninstalled prompt-toolkit-1.0.18
Successfully installed prompt-toolkit-2.0.10

feel well. Try starting jupyter notebook.

$ jupyter notebook
/anaconda3/lib/python3.6/site-packages/notebook/services/kernels/kernelmanager.py:19: VisibleDeprecationWarning: zmq.eventloop.minitornado is deprecated in pyzmq 14.0 and will be removed.

Tested on the web version.

OK! It's done!

(1 hour)