学ぶ Modifying Functions in Python

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Reconsider the example with the country information. If the provided name parameter isn't found in the dataset, a missing key error will occur. However, this situation can be easily handled by implementing conditional statements.


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# Data
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 
                  'Germany': (357114, 83783942), 'Brazil': (8515767, 212559417), 
                  'India': (3166391, 1380004385)}

# Modify our function
def country_information_mod(dict, name):
    if name not in dict.keys():
      print("There is no information about", name)
    else:
      print("Country:", name)
      print("Area:", dict[name][0], 'sq km')
      print("Population:", round(dict[name][1]/1000000, 2), 'mln')
        
# Testing the function
country_information_mod(countries_dict, "USA")
country_information_mod(countries_dict, "Ukraine")

The dict.keys() method returns a view of all the dictionary keys. It's used here to check if the provided name exists among the keys. The message is more user-friendly and doesn't stop our program.

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セクション 6. 章 9

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