Python的比較兩個CSV文件，並且將數據追加到csv文件

Question

我有下面的格式2個CSV文件：

首先是outputTweetsDate.csv：

Here is some text;13.09.13 16:45 
Here is more text;13.09.13 16:45 
And yet another text;13.09.13 16:46 

第二個文件是apiSheet.csv ：

13.09.13 16:46;89.56 
13.09.13 16:45;90.40 

我想這兩個文件進行比較，如果兩個日期時間值匹配的文本和數據添加到一個新文件（finalOutput.csv）：

|89.56|,|Here is some text| 
|89.56|,|Here is more text| 
|90.49|,|And yet another text| 

這是我的代碼，我到目前爲止有：

with open("apiSheet.csv", "U") as in_file1, open("outputTweetsDate.csv", "rb") as in_file2,open("finalOutput.csv", "wb") as out_file: 
    reader1 = csv.reader(in_file1,delimiter=';') 
    reader2 = csv.reader(in_file2,delimiter='|') 
    writer = csv.writer(out_file,delimiter='|') 
    for row1 in reader1: 
     for row2 in reader2: 
      if row1[0] == row2[1]: 
       data = [row1[1],row2[0]] 
       print data 
       writer.writerow(data) 

我修改了代碼，它現在的作品，到目前爲止，但它並不低谷遍歷所有代碼正確。 瞬間我的輸出是這樣的：

|89.56|,|Here is some text| 
|89.56|,|Here is more text| 

所以它不顯示我的第三個，即使它們是相同的。它似乎不是通過文件迭代。

謝謝！

Answer 1

在讀取file1的第二行之前，您的第二個循環到達file2（outputTweetsDate.csv）的末尾。

試試這個片斷：

with open("apiSheet.csv", "U") as in_file1, open("outputTweetsDate.csv", "rb") as in_file2,open("finalOutput.csv", "wb") as out_file: 
    reader1 = csv.reader(in_file1,delimiter=';') 
    reader2 = csv.reader(in_file2,delimiter='|') 
    writer = csv.writer(out_file,delimiter='|') 
    row2 = reader2.next() 
    for row1 in reader1: 
     while row2 and row1[0] <= row2[1]: 
      if row1[0] == row2[1]: 
       data = [row1[1],row2[0]] 
       print data 
       writer.writerow(data) 
      row2 = reader2.next() 

編輯 逆順序是棘手。讓我們停止嘗試變得聰明，並做一些暴力。它會毫無問題地工作，因爲這些文件遠不如你的RAM。

with open("apiSheet.csv", "U") as in_file1, open("outputTweetsDate.csv", "rb") as in_file2,open("finalOutput.csv", "wb") as out_file: 
    reader1 = csv.reader(in_file1,delimiter=';') 
    reader2 = csv.reader(in_file2,delimiter='|') 
    writer = csv.writer(out_file,delimiter='|') 

    rows2 = [row for row in reader2] # all the content of file2 goes in RAM. 
    for row1 in reader1: 
     for row2 in rows2: 
      if row1[0] == row2[1]: 
       data = [row1[1],row2[0]] 
       print data 
       writer.writerow(data)