python - 尝试写入 JSON 文件时出现 UnicodeEncodeError

Question

给定包含内容的输入文件：

{ "symbol": "°C" }

而这段代码：

import sys
import json

with open(sys.argv[1], 'r') as ifile, open(sys.argv[2], 'w') as ofile:
    json.dump(json.load(ifile), ofile, indent=4, ensure_ascii=False)

我收到一个错误：

$ python2.7 play.py input.json output.json
Traceback (most recent call last):
  File "play.py", line 5, in <module>
    json.dump(json.load(ifile), ofile, indent=4, ensure_ascii=False)
  File "/usr/lib/python2.7/json/__init__.py", line 190, in dump
    fp.write(chunk)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xb0' in position 1: ordinal not in range(128)

但 Python 3 工作正常：

$ python3.3 play.py input.json output.json
$ cat output.json 
{
    "symbol": "°C"
}

Answer 1

您可以codecs通过声明文件的编码来使用模块来处理它：

import sys
import json
import codecs

with codecs.open(sys.argv[1], 'r', 'utf-8') as ifile, codecs.open(sys.argv[2], 'w', 'utf-8') as ofile:
    json.dump(json.load(ifile), ofile, indent=4, ensure_ascii=False)