Question

我有以下格式的两个csv文件：

第一个是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

我想比较这两个文件，如果两个日期时间值匹配，请将文本和数据添加到一个新文件中（finalOutput.csv）：

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

这是我到目前为止的代码：

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)

我编辑了我的代码，它现在可以运行到目前为止，但它并没有正确地迭代我的所有代码。我的输出暂时是这样的：

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

所以它没有向我显示第三个，即使它们是相同的。好像通过文件没有好好迭代。

谢谢！

Answer 1

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

试试这个代码段：

 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()

修改的逆序非常棘手。让我们停止尝试聪明并做一些暴力。它将完美地工作，因为文件远远低于你的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)

Python比较两个csv文件并将数据附加到csv文件

1 个答案: