嵌套dict python中唯一值的计数

Question

我有一个像这样的字典：

dict = {
    "a": {"Azerbaijan": 20006.0, "Germany": 20016.571428571428},
    "b": {"Chad": 13000.0, "South Africa": 3000000.0},
    "c": {"Chad": 200061.0, "South Africa": 3000000.0}
}

而且，我正在尝试确定每个独特国家/地区和价值的发生次数。

例如， {"Chad": 2, "South Africa": 2,..} ， {"3000000": 2, "13000": 1,..}

我正在使用下面的代码，但它不是很聪明，是否有更好的方法来执行此操作，而无需花费很长的迭代周期，因为实际的dict很大？

seencountries = {}
seenvalues = {}

for key, innerdict in dict.iteritems():
    for country, value in innerdict.iteritems():
        if value not in seenvalues.keys():
            seenvalues[value] = 0
        seenvalues[value]+=1
        if country not in seencountries.keys():
            seencountries[country] = 0
        seencountries[country]+=1

print seencountries

print seenvalues

Answer 1

from collections import Counter
seen_countries = Counter()
seen_values = Counter()
for data in your_dicts.itervalues():
    seen_countries += Counter(data.keys())
    seen_values += Counter(data.values())