Lära Functions Without Return in Python

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.


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# 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.

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 6. Kapitel 7

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              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.

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 6. Kapitel 7