如何避免JSON百分比编码和\ u转义? [英] How can I avoid JSON percent-encoding and \u-escaping?
问题描述
当我解析文件时
<html>
<head><meta charset="UTF-8"></head>
<body><a href="Düsseldorf.html">Düsseldorf</a></body>
</html>
使用
item = SimpleItem()
item['name'] = response.xpath('//a/text()')[0].extract()
item["url"] = response.xpath('//a/@href')[0].extract()
return item
我最终遇到了\u转义符
[{
"name": "D\u00fcsseldorf",
"url": "D\u00fcsseldorf.html"
}]
或带有百分比编码的字符串
or with percent-encoded strings
D%C3%BCsseldorf
along with the appropriate feed exporter setting
FEED_EXPORTERS = {
'json': 'myproj.exporter.UnicodeJsonLinesItemExporter',
}
没有帮助.
如何获取utf-8编码的JSON输出?
How do I get a utf-8-encoded JSON output?
我要重申/扩展一个未回答的问题.
更新:
与Scrapy正交，请注意，未设置
Orthogonal to Scrapy, note that without setting
export PYTHONIOENCODING="utf_8"
运行
> echo { \"name\": \"Düsseldorf\", \"url\": \"Düsseldorf.html\" } > dorf.json
> python -c'import fileinput, json;print json.dumps(json.loads("".join(fileinput.input())),sort_keys=True, indent=4, ensure_ascii=False)' dorf.json > dorf_pp.json
将失败
Traceback (most recent call last):
File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\xfc' in position 16: ordinal not in range(128)
更新
发布后，我的问题无法回答. UnicodeJsonLinesItemExporter可以工作，但是管道的另一部分是罪魁祸首:作为漂亮地打印JSON输出的后处理，我使用的是python -m json.tool in.json > out.json.
As posted my question was unanswerable. The UnicodeJsonLinesItemExporter works, but another part of the pipeline was the culprit: As a post-process to pretty-print the JSON output, I was was using python -m json.tool in.json > out.json.
推荐答案
这似乎对我有用
# -*- coding: utf-8 -*-
import scrapy
import urllib
class SimpleItem(scrapy.Item):
name = scrapy.Field()
url = scrapy.Field()
class CitiesSpider(scrapy.Spider):
name = "cities"
allowed_domains = ["sitercity.info"]
start_urls = (
'http://en.sistercity.info/countries/de.html',
)
def parse(self, response):
for a in response.css('a'):
item = SimpleItem()
item['name'] = a.css('::text').extract_first()
item['url'] = urllib.unquote(
a.css('::attr(href)').extract_first().encode('ascii')
).decode('utf8')
yield item
使用问题中引用的Feed导出程序，它也可以使用其他存储空间
using the feed exporter cited in your question, it worked also using another storage
# -*- coding: utf-8 -*-
import json
import io
import os
from scrapy.contrib.exporter import BaseItemExporter
from w3lib.url import file_uri_to_path
class CustomFileFeedStorage(object):
def __init__(self, uri):
self.path = file_uri_to_path(uri)
def open(self, spider):
dirname = os.path.dirname(self.path)
if dirname and not os.path.exists(dirname):
os.makedirs(dirname)
return io.open(self.path, mode='ab')
def store(self, file):
file.close()
class UnicodeJsonLinesItemExporter(BaseItemExporter):
def __init__(self, file, **kwargs):
self._configure(kwargs)
self.file = file
self.encoder = json.JSONEncoder(ensure_ascii=False, **kwargs)
def export_item(self, item):
itemdict = dict(self._get_serialized_fields(item))
self.file.write(self.encoder.encode(itemdict) + '\n')
(如有必要，删除评论)
(removing the comments if necessary)
FEED_EXPORTERS = {
'json': 'myproj.exporter.UnicodeJsonLinesItemExporter'
}
#FEED_STORAGES = {
# '': 'myproj.exporter.CustomFileFeedStorage'
#}
FEED_FORMAT = 'json'
FEED_URI = "out.json"
这篇关于如何避免JSON百分比编码和\ u转义?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
