def MostPopularKey(d, default):
"""Given a dict, return the key corresponding to the largest
value. Returns 'default' if the dict is empty."""
x = [(v, k) for (k, v) in d.iteritems()]
if not x: return default
x.sort()
return x[-1][1]
請教一下 x = [(v, k) for (k, v) in d.iteritems()]
這句是什么意思 ?
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