filenam类型错误

Question

我在第18行遇到以下错误-“TypeError:Open（）得到一个意外的关键字参数'filename2'”。有人能帮我找出我做错了什么吗？提前谢谢

import os
import win32com.client

path = r'XXX'
pathmaster = r'XXX\MyFile.xlsx'
filename=pathmaster

xl = win32com.client.DispatchEx('Excel.Application')
xl.Visible = False

wbmaster = xl.Workbooks.Open(filename)

sheets = os.listdir(path)

for sheet in sheets:
    print(sheet)
    wb1=xl.Workbooks.Open(filename2 = os.path.join(path,sheet))

    ws1 = wb1.Worksheets("Val")
    ws1.Name=sheet[:4]

    ws1.Copy(Before=wbmaster.Worksheets(1))
    wb1.Close(True)

wbmaster.Close(SaveChanges=True)