Subject: Re: Modern Sheets/XLS addons
Just a suggestion:

Subscribe to Gemini 3 or Claude and ask the AI to generate the Python code for what you wish to do. Even the free versions can generate quite complete code nowadays.

For reference, some commonly used Python libraries (all free):
yfinance: to get stock date from Yahoo Finance
pandas: for computation like moving averages (if needed, there are several other libraries for Technical Analysis)
matplotlib or plotly: for plotting charts
xlswriter or openpyxl: for saving to Excel files