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              【Python面試真題】- 對比一下dict中items與iteritems?

               D = {‘a’:1,’b’:2,’c’:3,’d’:4}    
               D.items()                       #一次性取出所有    
              [(‘a’, 1), (‘c’, 3), (‘b’, 2), (‘d’, 4)]    
               D.iteritems()                   #迭代對象,每次取出一個。用for循環遍歷出來;    
                  
               for i in D.iteritems():    
              …   print i,    
              …    
              (‘a’, 1) (‘c’, 3) (‘b’, 2) (‘d’, 4)    
               for k,v in D.iteritems():    
              …   print k,    
              …    
              a c b d    
              總結:   
              1. 一般iteritems()迭代的辦法比items()要快,特別是數據庫比較大時。  

              2. 在Python3中一般取消前者函數  



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