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a.sort(key = lambda x : x[1])
上述代码指的是：
sort排序函数中传入参数key，key的值为匿名函数lambda的返回值，匿名函数中的第一个x为参数，x[1]为函数表达式，1指的是取a的子元素的第二个值。
示例如下：
# 统计列表中每个元素的频次 list1 = ['A','B','C','A','A','B','A','B','C','C','C','C'] dict1
= {} # set构造集合对象,实现列表的去重 for i in set(list1): dict1[i] = list1.count(i) # 取出键值对
key_value = list(dict1.items()) print(key_value) # 按字母顺序排序的 key_value.sort()
print(key_value) # 按照频次从高到低排序 key_value.sort(key = lambda x:x[1], reverse=True)
print(key_value) # 输出结果为： # [('A', 4), ('B', 3), ('C', 5)] # [('A', 4), ('B',
3), ('C', 5)] # [('C', 5), ('A', 4), ('B', 3)]
