Python 排序

字典排序的原理就是把字典轉化成可以迭代的list來進行排序
字典排序（複雜）：

dicts = {"4":{"key1":"a","num":1},
         "2":{"key1":"a","num":2},
         "3":{"key1":"a","num":3},
         "1":{"key1":"a","num":4}}
items = sorted(dicts.items(), key=lambda d: d[1]['num'], reverse=True)

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字典：最簡單的按照key來

items = dicts.items() 
items.sort() 

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下面來看一下sorted方法

sorted(...)
    sorted(iterable, cmp=None, key=None, reverse=False) --> new sorted list

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#按照key進行排序 
sorted(dict1.items(), key=lambda d: d[0]) 
#按照value進行排序 
sorted(dict1.items(), key=lambda d: d[1])