擅长:python、mysql、java
<pre><code>>>> before = {'NewYork': {'Paris': 12, 'Hawaii': 8, 'Tokyo': 11, 'Incheon': 12, 'LA': 2},
... 'Beijing': {'Hongkong': 3, 'Cebu': 5}, 'Incheon': {'Cairo': 10, 'LA': 11, 'Tokyo': 1},
... 'Tokyo': {'NewYork': 12, 'Paris': 14, 'LA': 9}}
>>>
>>> print [(key,k,v) for key,val in before.iteritems() for k,v in val.iteritems()]
[('NewYork', 'Paris', 12), ('NewYork', 'LA', 2), ('NewYork', 'Hawaii', 8), ('NewYork', 'Incheon', 12), ('NewYork', 'Tokyo', 11), ('Beijing', 'Hongkong', 3), ('Beijin
g', 'Cebu', 5), ('Incheon', 'Cairo', 10), ('Incheon', 'Tokyo', 1), ('Incheon', 'LA', 11), ('Tokyo', 'NewYork', 12), ('Tokyo', 'Paris', 14), ('Tokyo', 'LA', 9)]
</code></pre>