0
>>> basket = {'fruit' : 'apple','veg' : 'potato', 'grain' : 'rice', 'liquor' : 'wine'}
>>> for k,v in basket.iteritems():
... print k,v
...
veg potato
liquor wine
fruit apple
grain rice
>>>
從上面的例子可以看出,鍵值對不是從左到右或從右到左打印的。爲什麼Python中的iteritems()函數以隨機順序檢索鍵值對?
爲了得到一個排序結果,我用
>>> basket = {'fruit' : 'apple','veg' : 'potato', 'grain' : 'rice', 'liquor' : 'wine'}
>>> for k,v in sorted(basket.iteritems()):
... print k,v
...
fruit apple
grain rice
liquor wine
veg potato
>>>
當我試圖讓鍵值對的指數,我得到
>>> basket = {'fruit' : 'apple','veg' : 'potato', 'grain' : 'rice', 'liquor' : 'wine'}
>>> for k,v in enumerate(basket.iteritems()):
... print k,v
...
0 ('veg', 'potato')
1 ('liquor', 'wine')
2 ('fruit', 'apple')
3 ('grain', 'rice')
>>>
爲什麼會出現這種情況?如何從左至右打印字典定義中顯示的鍵值對?
詞典沒有排序。 – 2014-10-30 15:15:04