[Python边学边记知识点集] json.dumps()解析字符串总是多出双引号

解析：

json.dumps（）:将dict格式数据转换成json格式字符串。

然后需要通过 json.loads()，将 json格式字符串转换成字典

实例：

from pathlib import Path
import json

path = Path('username.json')
if path.exists():
    contents = path.read_text()
    username = json.dumps(contents)
    print(f"Welcome back, {username} !")
else:
    username = input("What's your name: ")
    contents = json.loads(username)
    path.write_text(contents)
    print(f"I'll remmember you next time, {username}.")

运行后输出结果如此：

打开username.json文件查看

目标：

如何去掉运行后的双引号

通过json.dumps写入的 json文件字符串总是有双引号，否则人为去除，运行会报错

Traceback (most recent call last):
  File "C:/-/remember_me.py", line 7, in
    username = json.loads(contents)
  File "C:\Users\c-\anaconda3\lib\json\__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "C:\Users\c-i\anaconda3\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Users\c-\anaconda3\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
 

将json.dumps()与 json.loads()互换

看下效果：

from pathlib import Path
import json

path = Path('username.json')
if path.exists():
    contents = path.read_text()
    username = json.loads(contents)
    print(f"Welcome back, {username} !")
else:
    username = input("What's your name: ")
    contents = json.dumps(username)
    path.write_text(contents)
    print(f"I'll remmember you next time, {username}.")