How to save Jupyter Notebook to HTML by code?

Question

I have a Jupyter Notebook program, which do analysis for me. After it's been run, I want to save it as HTML so I can view it later. (And then I can change the input data file to do analysis for other data.)

Typically, I do this by hand. This would look like

But this feels very tedious for me. So I'm wondering if there is any code can do this for me? Maybe something like

%save_html
# or with a file_name
%save_html file_name

---

Note: I have figured out a workaround for this. But I didn't find too much info by search, so I post it here and it may help someone else having the same problem. I'll post my solution as an answer.

Answer 1

just execute this snippet

!!jupyter nbconvert *.ipynb

Answer 2

I'll give an answer myself.

from IPython.display import Javascript
from nbconvert import HTMLExporter

def save_notebook():
    display(
        Javascript("IPython.notebook.save_notebook()"),
        include=['application/javascript']
    )

def output_HTML(read_file, output_file):
    import codecs
    import nbformat
    exporter = HTMLExporter()
    # read_file is '.ipynb', output_file is '.html'
    output_notebook = nbformat.read(read_file, as_version=4)
    output, resources = exporter.from_notebook_node(output_notebook)
    codecs.open(output_file, 'w', encoding='utf-8').write(output)

In the last cell of the notebook, something like

import time

save_notebook()
time.sleep(3)
current_file = 'GMM.ipynb'
output_file = 'output_file.html'
output_HTML(current_file, output_file)