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我有一段代码在python3中出错：
self.instance_id = get_instance_metadata(data='meta-data/instance-id').keys()[0]
TypeError: 'dict_keys' object is not subscriptable我改变了我的代码，我得到不同的错误（我想我需要更多的经验）：
self.instance_id = get_instance_metadata(list(data='meta-data/instance-id').keys())[0]
TypeError: list() takes no keyword arguments
1条答案
按热度按时间bakd9h0s1#
.keys()is aset-like view, not a sequence, and you can only index sequences.If you just want the first key, you can manually create an iterator for the
dict(withiter) and advance it once (withnext):Your second attempt was foiled by mistakes in where you performed the conversion to
list, and should have been:but it would be less efficient than the solution I suggest, as your solution would have to make a shallow copy of the entire set of keys as a
listjust to get the first element (big-OO(n)work), wherenext(iter(thedict))isO(1).