Closes #14. Adds functions to select more data like GDP per capita and GDP (PPP). Adds id_column parameter to WEO constructor so that users can choose to return columns with country names as indices instead of ISOs. Increases functionality of accept_year so that users can select multiple years like so: w.gdp_usd([2008, 2016]) for data from 2008 and 2016 and w.gdp_usd(start_year=2010, end_year=2020) for data from 2010-2020.
Closes #14. Adds functions to select more data like GDP per capita and GDP (PPP). Adds
id_columnparameter to WEO constructor so that users can choose to return columns with country names as indices instead of ISOs. Increases functionality of accept_year so that users can select multiple years like so:w.gdp_usd([2008, 2016])for data from 2008 and 2016 andw.gdp_usd(start_year=2010, end_year=2020)for data from 2010-2020.