Python的比较两个CSV文件，并且将数据追加到csv文件

Question

我有下面的格式2个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 

第二个文件是apiSheet.csv ：

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

我想这两个文件进行比较，如果两个日期时间值匹配的文本和数据添加到一个新文件（finalOutput.csv）：

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

这是我的代码，我到目前为止有：

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) 

我修改了代码，它现在的作品，到目前为止，但它并不低谷遍历所有代码正确。 瞬间我的输出是这样的：

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

所以它不显示我的第三个，即使它们是相同的。它似乎不是通过文件迭代。

谢谢！

Answer 1

在读取file1的第二行之前，您的第二个循环到达file2（outputTweetsDate.csv）的末尾。

试试这个片断：

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() 

编辑 逆顺序是棘手。让我们停止尝试变得聪明，并做一些暴力。它会毫无问题地工作，因为这些文件远不如你的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)