[PYTHON] Build a Docker container and save png from altair

I took a lot of trial and error, so I'll just upload the results. When I installed the latest version of chromedriver-binary, the major version was larger than google-chrome-stable and I got an error. It seems that you can use something other than stable on the Chrome side, but I decided to match chromedriver-binary with Chrome.

Dockerfile

FROM python

#Chrome installation
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add && \
    echo 'deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main' | tee /etc/apt/sources.list.d/google-chrome.list && \
    apt update && apt install -y google-chrome-stable

WORKDIR /python
COPY requirements.txt .
# chromedriver-Match major version of binary to Chrome
#     google-chrome --version: "Google Chrome 0.0.0.0"Returns a string like
#     grep --only-matching:    (In each line)Returns all the matched parts in order
#     head -n 1:Get only the major version
#     sed --in-place:I do not know
RUN sed -e s/chromedriver-binary/chromedriver-binary==`google-chrome --version | grep -o -E "[0-9]*" | head -n 1`.*/ -i requirements.txt

RUN pip install --upgrade pip && pip install -r requirements.txt

requirements.txt

altair
altair_saver
chromedriver-binary
jupyter
matplotlib
numpy
pandas
scipy==1.5
selenium

The titles should be ʻaltair, ʻaltair_saver, chromedriver-binary, selenium.

main.py

import altair
import chromedriver_binary              #PATH is passed by import;Not used as a module
altair.renderers.enable('altair_saver') #There was an argument to specify the format in the official document, but I removed it because I was angry
altair.Chart(...).....save('plot.png')  #Successful