Python中 字典 排序的方法
Description:Dictionaries can't be sorted -- a mapping has no ordering! -- so, when you feel the need to sort one, you no doubt want to sort its *keys* (in a separate list). Sorting (key,value) pairs (items) is simplest, but not fastest.
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# (IMHO) the simplest approach:
def sortedDictValues1(adict):
items = adict.items()
items.sort()
return
# an alternative implementation, which
# happens to run a bit faster for large
# dictionaries on my machine:
def sortedDictValues2(adict):
keys = adict.keys()
keys.sort()
return for key in keys]
# a further slight speed-up on my box
# is to map a bound-method:
def sortedDictValues3(adict):
keys = adict.keys()
keys.sort()
return map(adict.get, keys)
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