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我有一个 csv 文件，我试图在第 2 列之后的列中查找所有 uniq 值，其中第 1 列具有相同的值，并将其合并到一个新的 csv 文件中。我知道，这听起来很令人困惑，所以这里有一个例子：

原始文件 foo.csv 的样本：

"Boom Lifts","Model Number","Manufacturer","Platform Height","Horizontal Outreach","Lift Capacity"
"Boom Lifts","Model Number","Platform Height","Horizontal Outreach","Up & Over Height","Platform Capacity"
"Boom Lifts","Model Number","Platform Height","Horizontal Outreach","Up & Over Height"
"Pusharound Lifts","Model Number","Manufacturer","Platform Height","Stowed Height"
"Scissor Lifts","Model Number","Manufacturer","Platform Height","Stowed Height","Overall Dimensions","Platform Extension"
"Scissor Lifts","Overall Dimensions","Platform Size","Platform Extension","Lift Capacity"

理想的结果 bar.csv：

"Boom Lifts","Model Number","Manufacturer","Platform Height","Horizontal Outreach","Lift Capacity","Up & Over Height","Platform Capacity",,,
"Pusharound Lifts","Model Number","Manufacturer","Platform Height","Stowed Height"
"Scissor Lifts","Model Number","Manufacturer","Platform Height","Stowed Height","Overall Dimensions","Platform Size","Platform Extension","Lift Capacity"

每一行都有不同的长度，它是一个非常大的文件（超过 5k 行），我完全不知道如何进行匹配/字符串操作。是的，其中一些行在有“空单元格”的地方有尾随逗号。我一直在使用 Faster CSV，所以如果有办法做到这一点，那就太好了。

指针？最好是不会让我的mbp突然停止的东西？

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1 回答 1

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假设您可以使用 Faster CSV 将其放入二维数组中：

a = [
  ["Boom Lifts","Model Number","Manufacturer","Platform Height","Horizontal Outreach","Lift Capacity"]
  ["Boom Lifts","Model Number","Platform Height","Horizontal Outreach","Up & Over Height","Platform Capacity"]
  ["Boom Lifts","Model Number","Platform Height","Horizontal Outreach","Up & Over Height"]
  ["Pusharound Lifts","Model Number","Manufacturer","Platform Height","Stowed Height"]
  ["Scissor Lifts","Model Number","Manufacturer","Platform Height","Stowed Height","Overall Dimensions","Platform Extension"]
  ["Scissor Lifts","Overall Dimensions","Platform Size","Platform Extension","Lift Capacity"]
]

a.group_by {|e| e[0]}.map {|e| e.flatten.uniq}

得到你：

[
  ["Boom Lifts", "Model Number", "Manufacturer", "Platform Height", "Horizontal Outreach", "Lift Capacity", "Up & Over Height", "Platform Capacity"]
  ["Pusharound Lifts", "Model Number", "Manufacturer", "Platform Height", "Stowed Height"]
  ["Scissor Lifts", "Model Number", "Manufacturer", "Platform Height", "Stowed Height", "Overall Dimensions", "Platform Extension", "Platform Size", "Lift Capacity"]
]

不会是瞬时的，但不应降低您的 MBP。

于 2011-12-06T04:51:41.693 回答