真棒！彻底解决了一直困扰的编码问题

def correctSubtitleEncoding(filename, 
                            newFilename, 
                            encoding_from, 
                            encoding_to='UTF-8'):
    with open(filename, 'r', encoding=encoding_from) as fr:
        with open(newFilename, 'w', encoding=encoding_to) as fw:
            for line in fr:
                fw.write(line[:-1]+'\r\n')

filelocation = ""
outputfilelocation = ""

try:
    # open the CSV file
    inputfile = open(filelocation, 'rb')
    outputfile = open(outputfilelocation, 'w', encoding='utf-8')
    for line in inputfile:
        if line[-2:] == b'\r\n' or line[-2:] == b'\n\r':
            output = line[:-2].decode('utf-8', 'replace') + '\n'
        elif line[-1:] == b'\r' or line[-1:] == b'\n':
            output = line[:-1].decode('utf-8', 'replace') + '\n'
        else:
            output = line.decode('utf-8', 'replace') + '\n'
        outputfile.write(output)
    outputfile.close()
except BaseException as error:
    print("Error(18): opening CSV-file " + filelocation + " failed: " + str(error))

with open(file, 'rb') as f:
  rawdata = f.read()
  detect(rawdata)
    
>>> {'confidence': 0.99, 'encoding': 'utf-8'}

def get_encoding_type(current_file):
    detector.reset()
    for line in file(current_file):
        detector.feed(line)
        if detector.done: break
    detector.close()
    return detector.result['encoding']

import os    
from chardet import detect

# get file encoding type
def get_encoding_type(file):
    with open(file, 'rb') as f:
        rawdata = f.read()
    return detect(rawdata)['encoding']

from_codec = get_encoding_type(srcfile)

# add try: except block for reliability
try: 
    with open(srcfile, 'r', encoding=from_codec) as f, open(trgfile, 'w', encoding='utf-8') as e:
        text = f.read() # 小文件使用read， 大文件使用chunks
        e.write(text)

    os.remove(srcfile) # 删除原始文件
    os.rename(trgfile, srcfile) # 重命名新文件 
except UnicodeDecodeError:
    print('Decode Error')
except UnicodeEncodeError:
    print('Encode Error')

import sys
print(sys.maxunicode)

# 创建utf-8编码器  
look = codecs.lookup("utf-8")

name = 'DataStudio'
# 把name编码为内部的 unicode
tem_name = look.decode(name)
# tem_name[0]是数据，tem_name[1]是长度，这个时候的类型是unicode

# 把内部编码的unicode转换为utf-8编码的字符串
name =look.encode(b[0])

# 用codecs提供的open方法来指定打开的文件的语言编码，
# 它会在读取的时候自动转换为内部unicode  
file = codecs.open("dddd.txt", 'r', "big5")

import codecs

src="......\\xxxx.csv"
dst="......\\xxx_utf8.csv"

def ReadFile(filePath):
    with codecs.open(filePath, "r") as f:
        return f.read()

def WriteFile(filePath, u, encoding="utf-8"):
    # with codecs.open(filePath,"w",encoding) as f:
    with codecs.open(filePath, "wb") as f:
        f.write(u.encode(encoding, errors="ignore"))

def CSV_2_UTF8(src, dst):
    content = ReadFile(src)
    WriteFile(dst, content, encoding="utf-8")
    
CSV_2_UTF8(src, dst)

import codecs

src="......\\xxxx.csv"
dst="......\\xxx_utf8.csv"

def ReadFile(filePath,encoding="utf-8-sig"):
    with codecs.open(filePath,"r",encoding) as f:
        return f.read()

def WriteFile(filePath,u,encoding="utf-8"):
    #with codecs.open(filePath,"w",encoding) as f:
    with codecs.open(filePath,"wb") as f:
        f.write(u.encode(encoding,errors="ignore"))

def UTF8_2_GBK(src,dst):
    content = ReadFile(src,encoding="utf-8-sig")
    WriteFile(dst,content,encoding="utf-8")

UTF8_2_GBK(src,dst)

from __future__ import with_statement

import os
import sys
import codecs
from chardet.universaldetector import UniversalDetector

targetFormat = 'utf-8'
outputDir = 'converted'
detector = UniversalDetector()

def get_encoding_type(current_file):
    detector.reset()
    for line in file(current_file):
        detector.feed(line)
        if detector.done: break
    detector.close()
    return detector.result['encoding']

def convertFileBestGuess(filename):
   sourceFormats = ['ascii', 'iso-8859-1']
   for format in sourceFormats:
     try:
        with codecs.open(fileName, 'rU', format) as sourceFile:
            writeConversion(sourceFile)
            print('Done.')
            return
      except UnicodeDecodeError:
        pass


def writeConversion(file):
    with codecs.open(outputDir + '/' + fileName, 'w', targetFormat) as targetFile:
        for line in file:
            targetFile.write(line)
              
            
def convertFileWithDetection(fileName):
    print("Converting '" + fileName + "'...")
    format=get_encoding_type(fileName)
    try:
        with codecs.open(fileName, 'rU', format) as sourceFile:
            writeConversion(sourceFile)
            print('Done.')
            return
    except UnicodeDecodeError:
        pass

    print("Error: failed to convert '" + fileName + "'.")

# Off topic: get the file list and call convertFile on each file
# ...

import os
import sys
from Npp import notepad # import it first!

filePathSrc="C:\\Users\\" # Path to the folder with files to convert
for root, dirs, files in os.walk(filePathSrc):
    for fn in files: 
        if fn[-4:] == '.csv': # Specify type of the files
            notepad.open(root + "\\" + fn)      
            notepad.runMenuCommand("Encoding", "Convert to UTF-8")
            # notepad.save()
            # if you try to save/replace the file, 
            # an annoying confirmation window would popup.
            notepad.saveAs("{}{}".format(fn[:-4], '_utf8.csv')) 
            notepad.close()