fix(#29): add __len__ to ChainableDataFrame and wrap helper method returns #30
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…method returns - Add __len__ method to ChainableDataFrame that delegates to count() - Wrap returns from helper methods (countries, dependencies, regions, counties, cities, subtypes) in ChainableDataFrame so len() works - Clarify in README that helper methods return DataFrames, not namespaces
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Summary
Fixes #29 -
wkls.countries()has nolen, docs need updating__len__method toChainableDataFramethat delegates tocount(), enablinglen(wkls.countries())to workcountries,dependencies,regions,counties,cities,subtypes) inChainableDataFramesolen()works consistentlywkls.lafor Laos, notwkls.countries()["LA"])