排序元組可能存在或不

Question

我含有S的元組這樣

[(u'Delhi NCR', 148, 'checked'), 
    (u'New Delhi', 51), 
    (u'Gurgaon', 20), 
    (u'Faridabad', 18), 
    (u'Ghaziabad', 17), 
    (u'Greater Noida', 16), 
    (u'Noida', 11, 'checked'), 
    (u'Sonepat', 7), 
    (u'Palwal', 5), 
    (u'Gautam Buddh Nagar', 2), 
    (u'Rewari', 1)] 

我想有在他們checked參數元組移到top.Problem列表是第三個參數"checked"不得存在於所有的元組中，但只存在於選定的元組中。

如果我的元組的長度是一致的（"checked"參數存在於所有的元組），我可以做的排序是這樣

loc_list.sort(key=lambda x: x[2]) 

Answer 1

排序長度：

>>> L = [(u'Delhi NCR', 148, 'checked'), 
... (u'New Delhi', 51), 
... (u'Gurgaon', 20), 
... (u'Faridabad', 18), 
... (u'Ghaziabad', 17), 
... (u'Greater Noida', 16), 
... (u'Noida', 11, 'checked'), 
... (u'Sonepat', 7), 
... (u'Palwal', 5), 
... (u'Gautam Buddh Nagar', 2), 
... (u'Rewari', 1)] 
>>> print sorted(L, key=len, reverse=True) 
[(u'Delhi NCR', 148, 'checked'), (u'Noida', 11, 'checked'), (u'New Delhi', 51), (u'Gurgaon', 20), (u'Faridabad', 18), (u'Ghaziabad', 17), (u'Greater Noida', 16), (u'Sonepat', 7), (u'Palwal', 5), (u'Gautam Buddh Nagar', 2), (u'Rewari', 1)] 

或者：

>>> sorted(L, key=lambda x: x[-1] == 'checked', reverse=True) 
[(u'Delhi NCR', 148, 'checked'), (u'Noida', 11, 'checked'), (u'New Delhi', 51), (u'Gurgaon', 20), (u'Faridabad', 18), (u'Ghaziabad', 17), (u'Greater Noida', 16), (u'Sonepat', 7), (u'Palwal', 5), (u'Gautam Buddh Nagar', 2), (u'Rewari', 1)]