这是构建字典的最快方法吗？

Question

I am reading an element list from an xml file and make the data into 2 dictionaries.

Was this the fastest way? (I don't think this is the best, you guys always surprise me.;-)

ADict = {}
BDict = {}
for x in fields:
    key = x.get('key')
    ADict[key] = x.find('A').text
    BDict[key] = x.find('B').text

I think add it one by one is a bad idea, but write it in a single line. aka more pythonic way like this

 ADict,BDict = [dict(k) for k in zip(*([(x.get('key'),x.find('A').text),(x.get('key'),x.find('B').text)] for x in fields))]

I don't think it's better, two reasons, first, x.get('key') was called twice second, create too much temp tuples

Answer 1

Not tested, but should work

ADict = dict((x.get('key'), x.find('A').text) for x in fields)
BDict = dict((x.get('key'), x.find('B').text) for x in fields)