Functions Without Return in Python
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Functions often return data, but sometimes their purpose is simply to display information. Consider countries_dict, a dictionary structured as {country: (area, population)}. A function can take two arguments—d (a dictionary) and name (a key in d)—and display the information in a readable format instead of returning it.
1234567891011121314# Data countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942), 'Brazil': (8515767, 212559417), 'India': (3166391, 1380004385)} # Defining a function def country_information(dict, name): print('Country:', name) print('Area:', dict[name][0], 'sq km') print('Population:', round(dict[name][1]/1000000, 2), 'MM') # Testing the function country_information(countries_dict, 'Brazil') country_information(countries_dict, 'Germany')
In country_information(dict, name), the parameter dict receives countries_dict when called. Inside the function, dict[name][0] gives the area, and dict[name][1] gives the population.
These parameters are local variables, meaning they exist only within the function. When calling the function, countries_dict is passed as dict, and the country name as name.
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