1 def dict_traverse(): 2     from time import clock 3     my_dict = {‘name‘: ‘Jim‘, ‘age‘: ‘20‘, ‘height‘: ‘180cm‘, ‘weight‘: ‘60kg‘} 4  5     t_start = clock() 6     for key in my_dict:    # 性能最差写法.无优化 7         print ‘Type01.01: %s --- %s‘ % (key, my_dict[key]) 8     t1 = clock() 9 10     for key in my_dict:    # 性能较上优,可见get()方法作了优化.11         print ‘Type01.02: %s --- %s‘ % (key, my_dict.get(key))12     t2 = clock()13 14     for key in my_dict.keys():    # keys()方法也是作了优化.15         print ‘Type02.01: %s --- %s‘ % (key, my_dict[key])16     t3 = clock()17 18     for key in my_dict.keys():    # 19         print ‘Type02.02: %s --- %s‘ % (key, my_dict.get(key))20     t4 = clock()21 22     for key, value in my_dict.items():   # 标准写法,性能最佳写法23         print ‘Type03: %s --- %s‘ % (key, value)24     t5 = clock()25 26     for key, value in my_dict.iteritems():    # 性能较上,有少量损失.27         print ‘Type04: %s --- %s‘ % (key, value)28     t6 = clock()29 30     for key, value in zip(my_dict.iterkeys(),my_dict.itervalues()):    # 性能较差.31         print ‘Type05: %s --- %s‘ % (key, value)32     t7 = clock()33 34     print ‘********** time cost ******************‘35     print ‘Type01.01 -- total time : ‘, t1-t_start36     print ‘Type01.02 -- total time : ‘, t2-t137     print ‘Type02.01 -- total time : ‘, t3-t238     print ‘Type02.02 -- total time : ‘, t4-t339     print ‘Type03 -- total time : ‘, t5-t440     print ‘Type04 -- total time : ‘, t6-t541     print ‘Type05 -- total time : ‘, t7-t642 43 44 45 if __name__ == ‘__main__‘:46     dict_traverse()

1 for k, v in my_dict.items():2     print k, v