UnicodeDecodeError：在python 2.7中

Question

我正在使用VirusTotal api，正是如下： https://www.virustotal.com/es/documentation/public-api/#scanning-files

这是我的scritp中我遇到问题的部分：

def scanAFile(fileToScan):
    host = "www.virustotal.com"
    selector = "https://www.virustotal.com/vtapi/v2/file/scan"
    fields = [("apikey", myPublicKey)]
    file_to_send = open(fileToScan, "rb").read()
    files = [("file", fileToScan, file_to_send)]
    json = postfile.post_multipart(host, selector, fields, files)

    return simplejson.loads(json)

对于某些文件没有任何错误并且运行正常，但是在尝试扫描某些文件时发生了下一个错误，例如此错误是针对jpg文件的：

Traceback (most recent call last):
  File "F:/devPy/myProjects/script_vt.py", line 138, in <module>
    scanMyFile()
  File "F:/devPy/myProjects/script_vt.py", line 75, in scanQueue
    jsonScan = scanAFile(fileToScan)
  File "F:/devPy/myProjects/script_vt.py", line 37, in scanAFile
    json = postfile.post_multipart(host, selector, fields, files)
  File "F:\devPy\myProjects\script_vt.py", line 10, in post_multipart
    content_type, body = encode_multipart_formdata(fields, files)
  File "F:\devPy\myProjects\script_vt.py", line 42, in encode_multipart_formdata
    body = CRLF.join(L)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)

我应该指出我在windows下使用pycharm，这会导致编码错误吗？

知道怎么解决吗？我有堆栈，无法在网上找到任何解决方案。