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multi_func = lambda x : x*10
def data_pre_handle(data):
# 对输入数据依次执行以下操作，然后作为返回值输出
# 1. 映射，使用上面的multi_func函数作为参数
# 2. 分组，每3个分为一组，末尾不足一组的砍掉
# 3. 重复，将数据重复3次
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