将数据中的国家与python包pycountry匹配

我试图将数据中的国家与Python内置的pycountry包进行匹配。运行后，我得到了这个错误

raise AttributeError

属性错误

countries_lookup = {}
countries = list(pycountry.countries)
for country in countries:    
    countries_lookup[country.alpha2]=country.name
country_names = list(countries_lookup.values())
country_names = [country.lower() for country in country_names]
country_names = set(country_names)

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应该是什么问题？

只是一个需要更正的输入错误：

countries_lookup[country.alpha_2]=country.name
#-----------------------------^