小编Cac*_*ses的帖子

我有以下课程:

class Countries(object):
    def __init__(self, country_capital, country_population):
        self.capital = country_capital
        self.population = country_population

以及连接到类的变量列表:

france = Countries("Paris", "66")
england = Countries("London", "53")
usa = Countries("Washington, DC", "318")
germany = Countries("Berlin", "80")

我如何按人口顺序查看国家()首都？例如["伦敦","巴黎","柏林","华盛顿特区"]