pyton下内置open函数报错TypeError: 'encoding' is an invalid keyword argument for this function

报错信息：

Traceback (most recent call last):
  File "D:\program_python\python_home\wordCloud\mWordCloud.py", line 11, in <module>
    txt = open("test.txt",'r',encoding='GBK').read()
TypeError: 'encoding' is an invalid keyword argument for this function
[Finished in 549ms]

根据网上资料，将open修改为io.open()即可，同时需要

import io