python 多级字典实现

这是很早之前百度到的国外的代码，我是菜鸟，我感觉这段代码很强悍。分享给大家。

def setdict(d, attrs=[]):
    # Adds "val" to dict in the hierarchy mentioned via *attrs
    for attr in attrs[:-2]:
        # If such key is not found or the value is primitive supply an empty dict
        if d.get(attr) is None: ##or isinstance(d.get(attr), dict):
            d[attr] = {}
        d = d[attr]
    d[attrs[-2]] = attrs[-1]

通过打印过程中id(d)的变化，才搞清咋回事。我私自改了一下。

def xsetdict(d, attrs=[]):
    for attr in attrs[:-2]:
        if d.get(attr) is None:  ##or isinstance(d.get(attr), dict):
            print(id(d),'  ->', d)
            d[attr] = {}
            print(id(d), '  -->', d)
        d = d[attr]
        print(id(d), '  --->', d)
    d[attrs[-2]] = [attrs[-1]] + d.get(attrs[-2],[])

xx = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘x’]
res = {}
setdict(res,xx)
print(res)
#结果:
{‘a’: {‘b’: {‘c’: {‘d’: {‘e’: [‘x’]}}}}}