This assignment will test the following skills:
- Reading and writing to the file system
- Making HTTP requests
- Testing read & write operations to the disk
- Testing HTTP requests using a mock library
- Packaging the script using setup.py
Write a program which will generate up-to-date performance reports for a given stock portfolio. The program will accept two arguments: an input CSV file which contains the holdings information, and, a path to output the CSV report.
We will use the IEX Trading API, as the market data source – it is a public (free) API.
The program will read a CSV file containing our portfolio data. Based on this data, a new CSV report will be generated using live market value to indicate our current holding performance using the IEX API.
The program will be installable using pip, and requires a setup.py file. When installed, a binary will be added to the Python path which can be invoked from anywhere on the filesystem.
An example interaction with the script looks like this:
$ portfolio_report --source portfolio.csv --target report1.csv
The input CSV will have 3 columns (example provided).
- symbol: the ticker symbol (e.g. AAPL is Apple)
- units: the quantity of shares held
- cost: the original / average purchase price of the holding
Using the list of symbols from the input CSV, get quotes from IEX to fetch the latest price. This can be done in a batch request – meaning, multiple quotes can be requested in a single HTTP request. See:
Example request & response
Example request: GET the latest quotes for Apple, Facebook & Snapchat:
Once the latest price is obtained, a series of calculations are made to establish the current performance of the portfolio: what the current market value is, the gain and loss for each holding and a percentage of change.
If a symbol listed in the input CSV is not found on the exchange, the IEX API ignores it. Your script should account for this situation by warning the user that the symbol was not found, but continue to process the rest of the valid symbols.