如何在Python中从文件和隐秘读取dict数据到JSON

Question

I have following data in file. Getting error while I read and try convert to JSON.

File(modes.txt) :

{'status': True, 'mode': 'full'} {'status': False, 'mode': 'half'}

Code:

with open("modes.txt",'r') as f:
   ds = json.dumps(json.load(f))

Error:

JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

Error is on expected line as file string in files are not double quoted. I could solve the problem replacing single-quote to double-quote. What is good/elegant solution for this scenario?

Answer 1

Three issues with your source file's json format (tl;dr: it's not valid json)

1. it's a series of dicts, but they aren't in a list, they're bare
2. True is true in json, same for False which is false
3. As you noted, single vs double quotes.

You can get around these problems with the following:

import json

ds = list()


with open("modes.txt", 'r') as f:
    for line in f.readlines():
        fixed_line = line.replace('\'', '"').replace("False", "false").replace("True", "true").strip()
        ds.append(json.loads(fixed_line))

This reads each line from your file, very roughly fixes it, and appends it to a list. End results is a list of dicts.

Please note this code is an example that's meant to demonstrate possible workarounds, don't actually use this in production. What if you modes.txt contains escaped doublequotes? Or the words True or False within strings?

Short answer: you should fix the input file to contain valid json.