如何在python中創建一箇舊的dicts列表？

Question

我有這樣的名單：

l1 = [{ 'likes': 10, 'dislikes': 1, 'title': u'sometext'}, {''likes': 7, dislikes': 5, 'title': u'other text'}] 

現在我想用一個score更換likes和dislkes，使score = likes - dislikes

結果應該是：

l2 = [{'score': 9, 'title': u'sometext'}, {'score': 2, 'title': u'other text'}] 

我不知道如何最好在Python 2.7中做到這一點？

Answer 1

l2 = [{'score': (el['likes'] - el['dislikes']), 'title': el['title']} for el in l1]