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PYTHON PROGRAM

by using functions & dictionary or set.

- must create a variable to hold a dictionary or sets

- must define a function that accepts dictionaries or sets as an argument

A dictionary maps a set of objects (keys) to another set of objects (values). A Python dictionary is a mapping of unique keysBelgium Ivory Coast Italy Senegal El Salvador Central African Republic Ecuador France Equatorial Guinea Ireland Euro CFA fran

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Answer #1

We append each country to the result whose currency is the one as required by the user.

 def reverseLookup(country_currency,currency): countries=[] for key in country_currency: if country_currency[key]==currency: countries.append(key) return countries def main(): currency=input("Please enter the currency for which countries are to be found: ") country_currency={ 'Cameroon': 'CFA franc', 'Greece': 'Euro', 'Chad': 'CFA franc', 'Austria': 'Euro', 'Niger': 'CFA franc', 'Estonia': 'Euro', 'Finland': 'Euro', 'Republic of the Congo': 'CFA franc', 'United States': 'USD', 'Gabon': 'CFA franc', 'Germany': 'Euro', 'Belgium': 'Euro', 'Ivory Coast': 'CFA franc', 'Italy': 'Euro', 'Senegal': 'CFA franc', 'El Salvador': 'USD', 'Central African Republic': 'CFA franc', 'Ecuador': 'USD', 'France': 'Euro', 'Equatorial Guinea': 'CFA franc', 'Ireland': 'Euro' } print("{} is ised in the following countries: ".format(currency)+','.join(reverseLookup(country_currency,currency))) main()

def reverseLookup (country_currency, currency): countries=[] for key in country_currency: if country currency[key)==currency:

Sample output,

Please enter the currency for which countries are to be found: USD USD is ised in the following countries: United States, El

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