python2.7写中文数据到json文件报错UnicodeEncodeError

在学习python爬虫，准备把爬到的数据写到JSON文件中时，发现报错

原代码

#coding:utf-8import jsonfrom bs4 import BeautifulSoupimport requestsuser_agent = 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0'headers = {'User-Agent':user_agent}r = requests.get('http://seputu.com',headers=headers)soup = BeautifulSoup(r.text, 'html.parser',from_encoding='utf-8')content = []for mulu in soup.find_all(class_="mulu"):    h2 = mulu.find('h2')    if h2 != None:        h2_title = h2.string        list = []        for a in mulu.find(class_="box").find_all('a'):            href = a.get('href')            box_title = a.get('title')            list.append({'href':href,'bot_title':box_title})        content.append({'title':h2_title,'content':list})with open('qiye.json','wb') as fp:    json.dump(content,fp=fp,indent=4,ensure_ascii=False)

报错：

/usr/bin/python2.7 /home/repeat/PycharmProjects/untitled/qiye.py/home/repeat/.local/lib/python2.7/site-packages/bs4/__init__.py:146: UserWarning: You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.  warnings.warn("You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.")Traceback (most recent call last):  File "/home/repeat/PycharmProjects/untitled/qiye.py", line 24, in <module>    json.dump(content,fp=fp,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 characters in position 20-23: ordinal not in range(128)Process finished with exit code 1

解决办法：

把这段代码

with open('qiye.json','wb') as fp:    json.dump(content,fp=fp,indent=4,ensure_ascii=False)

改成

with codecs.open('qiye.json','wb','utf-8') as fp:    json.dump(content,fp=fp,indent=4,ensure_ascii=False)

即可。