第4章 初步整理

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是想快点出活,又不想自己碰这脏活累活。你悠着点,这玩意费时费力不出彩,还容易背锅。做得再干净,也就是个基础,后面分析出彩了是别人的,分析出问题了,搞不好第一个查你数据源头。”
    陈默没接这话茬,只说:“我先做着看看。”
    “行吧,你加油。”李涛耸耸肩,又把耳机戴了回去,重新面对他的代码。
    陈默回到自己座位,收到了李涛发来的字段说明文档。他打开快速看了一下,然后深吸一口气,关掉所有不必要的程序,新建了一个项目文件夹,按照自己的习惯建立子文件夹:原始数据、过程文件、清洗规则记录、问题记录、输出数据。
    他先不急着处理,而是花了一个多小时,把所有U盘里的文件大致浏览了一遍,记下每个文件的大小、大概行数列数、可能的关联字段。在笔记本上画了一个简单的关系图。然后,他开始尝试整理那些混乱的字段名。对照着天晟之前给过的零星文档(在公共盘某个角落找到的),以及李涛发来的参考说明,他逐一猜测、标注那些意义不明的列名。这个过程很慢,需要不断的搜索、比对、推测。遇到实在不确定的,他在问题记录文件里标红,记下文件名和列名。
    下午快下班时,王海又晃了过来,站在他身后,看着他的屏幕。
    (本章未完,请点击下一页继续阅读)第4章初步整理(第2/2页)
    “怎么样了?有头绪没?”
    “正在梳理字段,原始数据比较乱,很多列名需要确认。”陈默头也没回,眼睛盯着屏幕上一行行数据。
    “嗯,乱是肯定的。抓大放小,先把能确定的、重要的字段理出来。那些边缘的、实在搞不清的,可以先放放,或者统一归到一个‘其他信息’字段里,别耽误太多时间在细节上。”王海的声音从头顶传来,“关键是快。赵总那边等着看方向。”
    “明白。”陈默说。他手指在键盘上停顿了一下,然后继续敲打。他把一个标注为“可能需要业务确认”的字段,移到了“待定-低优先级”的分类下。
    “行,你继续。下班前给我个初步进展简报,几句话就行,说说目前进度和预计完成时间。”王海说完,走了。
    陈默看了一眼电脑右下角的时间。继续埋头在数据里。
    接下来两天,陈默几乎把自己钉在了工位上。除了上厕所和接水,很少离开。他按照清洗规则,编写脚本处理批量问题:统一日期格式,将文本型数字转换为数值型,处理明显的异常值(比如年龄为200岁,金额为负值)。对于缺失值,他根据字段性质,谨慎地选择填充方法,或者标记为缺失,并在记录文件里说明。去重时,他设定了几个关键字段组合作为唯一标识,删除了大量完全重复的记录,但对于部分字段相同、部分字段不同的疑似重复记录,他单独拎出来,做了个待核查清单。
    第三天下午,他遇到了一个棘手的问题。在核心的交易流水文件里,有一个关键字段“交易类型编码”,按照天晟给过的一份老旧编码表,应该是几位数字,对应不同的业务类型。但陈默发现,实际数据中混入了大量字母和特殊字符,甚至有些编码在给出的码表里根本不存在。他检查了数据来源,发现这个文件似乎是多个子系统导出的结果合并的,编码规则可能不统一。
    他停下脚本,在问题记录里详细描述了这个问题,并截图了异常编码的样本。这已经不是简单的清洗能解决的,需要业务方确认编码规则,或者至少明确哪些编码是有效的,哪些是无效的、需要如何处理。
    他整理了一下问题,带着笔记本去找王海。
    王海正在小会议室里打电话,门虚掩着。陈默站在门口等了一会儿。听到王海对着电话说:“……李总您放心,我们这边全力推进,初步分析很快就能出来……对,我们很重视,专门抽调了精干力量……明白,保持沟通……”
    又等了几分钟,王海挂了电话出来,看到陈默,脸上还带着讲电话时的笑容:“默默,什么事?数据弄好了?”
    “还没有。遇到个问题,需要确认。”陈默把笔记本屏幕转向他,指着那个编码混乱的问题,“这个字段很关键,后续分类汇总和分析都依赖它。但现在数据里编码很乱,跟给的码表对不上。可能需要联系天晟那边,确认一下准确的编码规则,或者提供一份最新的码表。不然清洗后的数据,这个字段不可用。”
    王海凑近看了看陈默指出的那些异常样本,眉头皱了起来。他手指在屏幕上敲了敲:“这么多乱七八糟的?”
    “嗯,比例不低。而且分散在不同时间段,不像是偶然错误。”陈默说。
    王海直起身,摸着下巴,思考了几秒钟。“联系天晟……他们那边IT对接人你又不是不知道,效率低,问个问题三天不回。而且这种细节问题,去问他们,显得我们水平不够,连个数据清洗都搞不
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