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python怎么生成一个嵌套字典，不想使用defaultdict实现

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Python C/C++ 嵌套字典 31008 次浏览

比如原生的dict属性

test=dict()
test['a']=1         # 这个可以实现
test['x']['y']=2    # 这个就会报错

我想生成一个递归字典，如果没有这个键则创建，哪种方法能简洁点，优雅点~~多谢了

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