UnicodeDecodeError: 'utf8' codec can't decode byte 0xc4 in position 0: i报错问题

# -*- coding: utf-8 -*-
"""
Created on Sat Mar 24 13:38:25 2018

@author: Administrator
"""
import pandas as pd
inputfile = 'E:/pythondata/meidi_jd1.txt' #评论文件
outputfile = 'E:/pythonresult/meidi_jd_process_1.txt' #评论处理后保存路径
data = pd.read_csv(inputfile,encoding='utf-8',header = None)
l1 = len(data)
data = pd.DataFrame(data[0].unique())
l2 = len(data)
data.to_csv(outputfile, index = False, header = False,encoding='utf-8')
print(u'删除了%s条评论。' %(l1 - l2))# -*- coding: utf-8 -*-
"