如何在Python

Question

对于上下文，我尝试使用soap API的流式响应，该API应输出CSV文件。响应输出以base 64编码的字符串，我必须将其写入CSV文件。

api文档说必须逐个缓冲区地读取响应，但我不熟悉c＃所以我不确定如何复制字节并在正确的上下文中写入。

这是我试图复制的代码。代码由api的文档提供：

byte[] buffer = new byte[4000];
bool endOfStream = false;
int bytesRead = 0;
using (FileStream localFileStream = new FileStream(destinationPath, FileMode.Create, FileAccess.Write))
{
   using (Stream remoteStream = client.DownloadFile(jobId, chkFormatAsXml.Unchecked))
   {
     while (!endOfStream)
     {
         bytesRead = remoteStream.Read(buffer, 0, buffer.Length);
         if (bytesRead > 0)
         {
              localFileStream.Write(buffer, 0, bytesRead);
              totalBytes += bytesRead;
         }
         else
         {
              endOfStream = true;
         }
      }
   }
}

我当前的python代码如下所示：

buffer = ???
bytesread = 0
with open('csvfile.csv','w') as file:
    #opens Pickle file
    with (open("data2.pkl", 'r+b')) as openfile:
        print openfile
        bytesread = len(openfile.read(4000))
        if bytesread > 0:
            ?????

任何帮助都会非常感激，即使它只是指向正确的方向。我也有一些问题引用了同样的问题。

Write Streamed Response(file-like object) to CSV file Byte by Byte in Python

How to replicate C# .read(buffer, 0, buffer.Length) in Python

更新：

我的代码现在看起来像：

import  shutil

with (open("data2.pkl", 'r')) as pklfile:
    with open('csvfile4.csv', 'wb') as csvfile:
        file.write(shutil.copyfileobj(pklfile,csvfile, 4000)

不幸的是，这只是将base64代码字面写入csv文件，我不确定如何正确解码