读取文件：TypeError: an integer is required (got type str)

读取文件的时候报错：

Traceback (most recent call last):
File "D:\Python35\test\csdn.py", line 46, in <module>
with open("test.txt","r","utf-8") as f:
TypeError: an integer is required (got type str)

　改成如下就好了

 with open("test.txt","r+","utf-8") as f: 

　问题解决。