词典/名单最大的关键

Question

我有以下字典：

[{'country': 'Armenia', 'population': '3026048'}, {'country': 'Angola', 'population': '25830958'}, {'country': 'Algeria', 'population': '40375954'}, {'country': 'Andorra', 'population': '69165'}, {'country': 'Anguilla', 'population': '14763'}, {'country': 'American Samoa', 'population': '55602'}, {'country': 'Aruba', 'population': '104263'}, {'country': 'Argentina', 'population': '43847277'}, {'country': 'Afghanistan', 'population': '33369945'}, {'country': 'Azerbaijan', 'population': '9868447'}, {'country': 'Australia', 'population': '24309330'}, {'country': 'Antigua and Barbuda', 'population': '92738'}, {'country': 'Albania', 'population': '2903700'}, {'country': 'Austria', 'population': '8569633'}] 

和下面的列表

[['Andorra', '69165'], ['Afghanistan', '33369945'], ['Algeria', '40375954'], ['American Samoa', '55602'], ['Aruba', '104263'], ['Armenia', '3026048'], ['Angola', '25830958'], ['Azerbaijan', '9868447'], ['Antigua and Barbuda', '92738'], ['Australia', '24309330'], ['Albania', '2903700'], ['Argentina', '43847277'], ['Anguilla', '14763'], ['Austria', '8569633']] 

我怎样才能提取人口最多的国家的国名（在第二值每个子列表）

您可以为列表或字典提供解决方案。

Answer 1

可以使用max用钥匙，为列表，这将是：

max(lst, key = lambda x: int(x[1])) 
# ['Argentina', '43847277'] 

---

同样的想法的字典，一个稍微不同的键功能：

max(d, key = lambda x: int(x['population'])) 
# {'country': 'Argentina', 'population': '43847277'} 

Answer 2

像这样（列表清单）：

pops = [] 

for small_list in big_list: 
    pops.append(int(small_list[1])) 

max_value = max(pops) 
max_index = pops.index(max_value) 

most_pop_country = big_list[max_index][0] 
print(most_pop_country) 

它基本上找到最大人口的指数，然后为其提取国名。