TypeError: 'dict_keys' object does not support indexing
在python2.x中，dict.keys()返回一个列表，在python3.x中，dict.keys()返回一个dict_keys对象，比起列表，这个对象的行为更像是set，因此不支持索引的。python
解决方案：list(dict.keys())[index]python3.x
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