these classes use some basic string manipulation to try to turn variety of possible inputs (integersstrings of different lengthsand othersinto the following formatsusa france date mm-dd-yyyy dd/mm/yyyy currency $ , eur there could obviously be more validation on the input in this codebut let' keep it simple and dumb for this example now that we have the formatters set upwe just need to create the formatter factoriesclass usaformatterfactorydef create_date_formatter(self)return usadateformatter(def create_currency_formatter(self)return usacurrencyformatter(class franceformatterfactorydef create_date_formatter(self)return francedateformatter(def create_currency_formatter(self)return francecurrencyformatter(now we set up the code that picks the appropriate formatter since this is the kind of thing that only needs to be set up oncewe could make it singleton--except singletons aren' very useful in python let' just make the current formatter module-level variable insteadcountry_code "usfactory_map "us"usaformatterfactory"fr"franceformatterfactoryformatter_factory factory_map get(country_code)(in this examplewe hardcode the current country codein practiceit would likely introspect the localethe operating systemor configuration file to choose the code this example uses dictionary to associate the country codes with factory classes then we grab the correct class from the dictionary and instantiate it