python版本是2.7，使用urllib2将文件推送至微信，在上传文件时，碰到这样一个问题：上传未经压缩的文本文件，可以成功；上传经过压缩的二进制文件，则提示编码错误

代码如下

def upload_tmpfile_old(self,filepath):

try:

#文件存在、文件可读、文件大小小于19M

if not (os.path.isfile(filepath) and os.access(filepath,os.R_OK)

and os.path.getsize(filepath)<19922944):

return -1

boundary = '----------%s' % hex(int(time.time() * 1000))

data = []

data.append('--%s' % boundary)

fr = open(filepath, 'rb')

data.append('Content-Disposition: form-data; name="media"; filename="pickdump"')

data.append('Content-Type: application/octet-stream\r\n\r\n')

data.append(fr.read())

fr.close()

data.append('--%s--\r\n' % boundary)

http_body = '\r\n'.join(data)

print http_body

sendurl = "https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token=" + Token.gettoken() + "&type=file"

req = urllib2.Request(sendurl, data=http_body)

req.add_header('Content-Type', 'multipart/form-data; boundary=%s' % boundary)

req.add_header('Content-Length',len(http_body))

print req.headers

self.resp = urllib2.urlopen(req, timeout=5)

print self.resp.__dict__

print self.resp.read()

except:

logger.exception("上传文件出现异常")

raise

if __name__ == '__main__':

uploadfile = wxRequest("WZ", '', '', "file", 1000002)

uploadfile.upload_tmpfile_old("/home/wz/12306.txt.zip")

报错信息如下：

Traceback (most recent call last):

File "/home/wzk/wx2x/wxpush.py", line 264, in

uploadfile.upload_tmpfile_old("/home/wzk/12306.txt.zip")

File "/home/wzk/wx2x/wxpush.py", line 227, in upload_tmpfile_old

self.resp = urllib2.urlopen(req, timeout=5)

File "/usr/lib64/python2.7/urllib2.py", line 154, in urlopen

return opener.open(url, data, timeout)

File "/usr/lib64/python2.7/urllib2.py", line 431, in open

response = self._open(req, data)

File "/usr/lib64/python2.7/urllib2.py", line 449, in _open

'_open', req)

File "/usr/lib64/python2.7/urllib2.py", line 409, in _call_chain

result = func(*args)

File "/usr/lib64/python2.7/urllib2.py", line 1242, in https_open

context=self._context)

File "/usr/lib64/python2.7/urllib2.py", line 1196, in do_open

h.request(req.get_method(), req.get_selector(), req.data, headers)

File "/usr/lib64/python2.7/httplib.py", line 1057, in request

self._send_request(method, url, body, headers)

File "/usr/lib64/python2.7/httplib.py", line 1097, in _send_request

self.endheaders(body)

File "/usr/lib64/python2.7/httplib.py", line 1053, in endheaders

self._send_output(message_body)

File "/usr/lib64/python2.7/httplib.py", line 895, in _send_output

msg += message_body

UnicodeDecodeError: 'utf8' codec can't decode byte 0xb6 in position 149: invalid start byte

以前用python3，byte和str有明确的区分。这个功能由于版本问题，只能用python2，结果发现编码各种坑啊。

压缩文件本来就是一个二进制文件，不能被utf-8解码也是正常的，不知道对于这个问题有没有方法解决？

PS 以前用requests的时候,是把文件读成bytes后，直接拼回body里面的，不知道这样做在python2中应该如何写？