Fixing Getting Financial Data Exercise

[max-alletsee]

Using AlphaVantage API instead of Google Finance, which is not supported anymore by Pandas Datareader.

In the current version, the exercise is not working because Pandas Datareader does not support Google Finance anymore (due to some changes in the Google Finance API). This was noticed by some users of the pandas exercises, see e.g. issue #99 . As discussed in the issue report, I've re-written the exercise using the AlphaVantage API.

I've tried to keep the overall exercise similar and changes to a minimum, but two additional changes where necessary:

1. The AlphaVantage API does not seem to return the ticker symbol; therefore, when requesting data for several symobols in the same request, it's ambiguous which data corresponds to which ticker symbol. To solve this issue, I'm sending separate API requests for each ticker symbol and then combine these via pd.concat().
2. LinkedIn was bought by Microsoft, so there is no data available shortly after this purchase date. I've replaced the LinkedIn with Microsoft in the exercises.

I hope that this pull request is helpful and I'm more than happy to discuss it.

[guipsamora]

Very cool!! Thanks a lot @max-alletsee ! 😊

[max-alletsee]

You're welcome - and thanks a lot for accepting my PR.