Can I paste juypter notebook source code directly into a notebook page? - jupyter-notebook

Can I paste juypter notebook source code directly into a notebook page?
I mean if i code a .ipynb file open in a text editor can I just copy and paste it into a running notebook? Or is that just madness?
Thanks,

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I just don't like to open jupyter notebook in web browser.
I google out but every answer is related to how can we open notebook from terminal directly.
I'd suggest looking at Jupytext's ability to do command line conversions back-and-forth from the notebook json structure to a python script (or markdown). If you already have the backbone of a notebook (.ipynb) file, you can convert it to .py script using jupytext --to py notebook.ipynb. That makes a text file that is easy to edit in your favorite terminal based text editor. The json in the .ipynb files is not as easy to edit directly.
Then when you are done editing, you can convert the .py script form back to a notebook with something like jupytext --to notebook notebook.py. Optionally, you can even execute it without opening a browser by adding --execute. I have an example conversion-and-execution command in use here.

How to I stop Jupyter Notebooks from creating and opening the HTML file?

Whenever I start a Jupyter Notebook, it creates and automatically opens an HTML file. How do I stop this? HTML files are opened by default on my system in my text editor, not my web browser, and my terminal allows me to click links to open them, and the link to the notebook is in the output of the command, so I don't need the link in the HTML file.
Should have thought of it first, but the help file answered the question (jupyter notebook --help):
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In classic Jupyter Notebook File -> Download as has a Notebook (.ipynb) option to download the original notebook source.
JupyterLab only seems to have File -> Export Notebook As ... only offers non Notebook options. Is there a simple way to download the actual notebook from JupyterLab
In Jupyter Lab, on the left side, there is tab "Files", which will show the directory structure. In that, right click on the Jupyter Notebook and there would be a option to download it.

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