python 字典(dict)遍历四种方法的性能

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for i in d:      t = i + d[i]    for k,v in d.items():      t = k + v     for k,v in d.iteritems():      t = k + v     for k,v in zip(d.iterkeys(),d.itervalues()):      t = k + v  </span>  


                                             
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