Python-字典(练习题)

Python-字典(练习题)

"""练习题"""cities = { 'Wuhan': { 'country': 'China', 'population': '1700', 'fact': 'nice' }, 'New York':{ 'country': 'America', 'population': '1600', 'fact': 'good' }, 'Paris':{ 'country': 'French', 'population': '1000', 'fact': 'normall' }}for city_name,city_info in cities.items(): print('city_name:'+city_name) country = city_info['country'] population = city_info['population'] fact = city_info['fact'] print('country:'+country+'\t'+'population:'+population+'\t'+'fact:'+fact+'\n')"""添加键和值"""cities['Wuhan']['history'] = 100print(cities.items())"""修改键和值"""cities['Wuhan']['history'] = 50print(cities.items())"""删除键和值"""del cities['Wuhan']['history']print(cities.items())

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