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python collections 的超赞功能
Python中的collections库是一个非常实用的工具库,是对基础数据结构的补充。 假设我们给定了一个字符串列表,需要计算列表中每个字符串的出现次数。 collections.OrderedDict 创建的字典可以保证键插入的顺序--在有序字典中,先插入的键会排在前面。 普通字典 ...
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