Python异常：TypeError: a bytes-like object is required, not 'str'

Python异常：TypeError: a bytes-like object is required, not ‘str’

import json

str = [{"userName" : "UserPython", "age" : 20}, (2, 3), 1]

with open("jsonTest.txt", "wb") as fp:
    json.dump(str, fp = fp)

异常分析：open(“jsonTest.txt”, “wb”)指定文件以二进制写模式打开，所以需要以二进制写入，不能写入字符串，而上面代码中str是一个列表字符串，所以报异常。

解决方法：因为上面代码中str是列表字符串，所以将open()函数中的打开文件方式改为“w”写模式即可

import json

str = [{"userName" : "UserPython", "age" : 20}, (2, 3), 1]

with open("jsonTest.txt", "w") as fp:
    json.dump(str, fp = fp)