该问题是由于在decode时出现了一个非法字符，可设置在解码时忽略这个错误，
解决方案：
使用
import codecs
提供的方法解决
csvFile = codecs.open(csvfilename, u'rb',encoding= u'utf-8',errors='ignore')
这是ptyhon help 文档的内容
- codecs. open ( filename, mode [, encoding [, errors [, buffering ] ] ] )
-
Open an encoded file using the given mode and return a wrapped version providing transparent encoding/decoding. The default file mode is 'r' meaning to open the file in read mode.
Note
The wrapped version will only accept the object format defined by the codecs, i.e. Unicode objects for most built-in codecs. Output is also codec-dependent and will usually be Unicode as well.
Note
Files are always opened in binary mode, even if no binary mode was specified. This is done to avoid data loss due to encodings using 8-bit values. This means that no automatic conversion of '\n' is done on reading and writing.
encoding specifies the encoding which is to be used for the file.
errors may be given to define the error handling. It defaults to 'strict' which causes a ValueError to be raised in case an encoding error occurs.
buffering has the same meaning as for the built-in open() function. It defaults to line buffered.