查询 Python 字典以从元组中获取值
问题描述
假设我有一个 Python 字典，但值是一个元组:
Let's say that I have a Python dictionary, but the values are a tuple:
例如
dict = {"Key1": (ValX1, ValY1, ValZ1), "Key2": (ValX2, ValY2, ValZ2),...,"Key99": (ValX99, ValY99, ValY99)}
我只想从元组中检索第三个值，例如.上例中的 ValZ1、ValZ2 或 ValZ99.
and I want to retrieve only the third value from the tuple, eg. ValZ1, ValZ2, or ValZ99 from the example above.
我可以使用 .iteritems() 来做到这一点，例如:
I could do so using .iteritems(), for instance as:
for key, val in dict.iteritems():
ValZ = val[2]
但是，有没有更直接的方法?
however, is there a more direct approach?
理想情况下，我想按键查询字典并只返回元组中的第三个值...
Ideally, I'd like to query the dictionary by key and return only the third value in the tuple...
例如
dict[Key1] = ValZ1 而不是我目前得到的，即 dict[Key1] = (ValX1, ValY1, ValZ1) 这是不可调用的...
dict[Key1] = ValZ1 instead of what I currently get, which is dict[Key1] = (ValX1, ValY1, ValZ1) which is not callable...
有什么建议吗?
解决方案
保持索引:
>>> D = {"Key1": (1,2,3), "Key2": (4,5,6)}
>>> D["Key2"][2]
6
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