组合数据类型练习，英文词频统计实例上

字典实例：建立学生学号成绩字典，做增删改查遍历操作。 ids=['01','11','21'] scores=[85,90,65] dic={} dic['01']=scores[1] dic['11']=scores[0] dic['21']=scores[2] print(dic) print(dic.keys()) print(dic.values()) print(dic.items(

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