python - JSON 对象必须是 str，而不是 'bytes'

Question

使用 Python 3.5.1，我提取了一个文本文件，其中每一行都是 JSON 格式:{"a":"windows", "b":"stairs"...}

import json
path = 'folder/data.txt'
records=[json.loads(line) for line in open(path,'rb')]

但是我收到错误:

the JSON object must be str, not 'bytes'

打印第一行文件没有问题，所以我很放心，文件路径是正确的。

Answer 1

以文本模式打开文件，而不是二进制模式(可能显式传递 encoding='utf-8' 以覆盖系统默认值，因为 JSON 通常存储为 UTF-8)。 json 模块只接受 str 输入；从以二进制模式打开的文件读取返回 bytes 对象:

# Using with statement just for good form; in this case it would work the
# same on CPython, but on other interpreters or different CPython use cases,
# it's easy to screw something up; use with statements all the time to build good habits
with open(path, encoding='utf-8') as f:
    records=[json.loads(line) for line in f]