Move US-specific data loading into its own module #19
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The data cleaning code becomes very country specific.
By separating it into a country-specific module, we can make
covid.data
more country-independent.Data-loading functions for any country can be registered. They must have compatible signatures and return a
DataFrame
with multi-index[region, date]
and columnspositive
andtotal
.Slices of this dataframe are used as model input. Therefore all region-specific data-cleaning must be done by the loader function.
The previous US-specific functions are imported for backwards-compatibility (tests pass).
More tests are added for the new country-independent loader API.