Access to Yahoo! API

[NoelJB]

As a tip regarding the Yahoo! Finance API for Java users ...

Yahoo! appears to do user-agent based blocking. The Java YahooFinance API hasn't been updated by the owner in years, leaving many unresolved issues and pull requests. In our experience, this leads to the current (3.17) version in Maven central being broken and useless, leading to the existence of over 200 forks.

One such fork is https://github.com/gilbertoca/yahoofinance-api. I cloned that repository to my hackathon VM, built the artifact, and pointed my test project to use it. That fork works for me. I tested with my own code, as well as the various samples on the web page.

For Python users, the code on the portfolio project page still works for me. At some point, we might need to add a user-agent entry, e.g., storage_options = {'User-Agent': 'Mozilla/5.0'}).