更快的CSV +試圖找到獨特的項目

我有一個csv文件，我試圖找到列2中列中的所有uniq值，其中列1具有相同的值並將其合併到一個新的csv文件中。我知道，這聽起來令人困惑的方式所以這裏有一個例子：更快的CSV +試圖找到獨特的項目

原始文件foo.csv的樣本：

"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"

了理想的結果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"

每個行的長度是不同的，它是一個非常大的文件（超過5千行），我完全不知道如何執行匹配/字符串操作。是的，其中一些線條有尾隨逗號，其中有「空單元格」。我一直在使用更快的CSV，所以如果有辦法做到這一點，那就太好了。

指針？最好是不會讓我的mbp陷入戛然而止的狀態？

來源

2011-12-06 MarkL

因此，a）第一列可以被視爲一個關鍵字，以及b）所有後續列可以被視爲列表中的值，最後您希望這個列表包含唯一值......？ bar.csv中的最後一行重複「外形尺寸」和「平臺擴展」。重複的值是否可以？ – buruzaemon

我的不好，維度和平臺擴展不應重複。我想用更快的CSV讀入一個文件foo.csv並吐出另一個bar.csv。謝謝。 – MarkL

假設你可以把它與更快的CSV二維數組：

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}

讓你：

[ 
    ["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"] 
]

不會是瞬間的，但不應該把你的MBP下來。

來源

2011-12-06 04:51:41 seph

更快的CSV +試圖找到獨特的項目

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