python 修改excel

from xlrd import open_workbook
from xlutils.copy import copy
import sys
reload(sys)
sys.setdefaultencoding('utf-8')

def replaceexcel(file_path,replacedic):

    # 0 based (subtract 1 from excel row number)
    START_ROW = 1
    ismal_index = 0

    #formatting_info=True保存之前数据的格式
    rb = open_workbook(file_path,formatting_info=True)
    r_sheet = rb.sheet_by_index(0) # read only copy to introspect the file
    wb = copy(rb) # a writable copy (I can't read values out of this, only write to it)
    w_sheet = wb.get_sheet(0) # the sheet to write to within the writable copy


    #r_sheet.nrows为总行数
    for row_index in range(START_ROW, r_sheet.nrows):
        newcellvalue = ''
        oldcellvalue = r_sheet.cell_value(row_index,0)
        if isinstance(oldcellvalue, (str, unicode)):
           oldcellvalue = oldcellvalue.replace(' ','')
        try:
            findnum = oldcellvalue.find('_')
            findstr = oldcellvalue[:findnum]
            newcellvalue = replacedic[oldcellvalue[:findnum]]+oldcellvalue[findnum:]
        except:
            newcellvalue = oldcellvalue
        print newcellvalue,oldcellvalue
        w_sheet.write(row_index, ismal_index,newcellvalue)

    wb.save(file_path)

file_path = "C:\Users\Administrator\Desktop\test.xls"
dic = {'111':u"牛逼2",'222':u"大龙2"}
replaceexcel(file_path,dic)