Web spider: [ValueError] No JSON object could be decoded

Question

Recenetly I have been doing the web spider for fun. I want to learn how to login a website with verify code. One way I learnt is to use cookies. So I had a try. But I realised a problem. For example, I want to use request.session to get url:www.lovetvshow.com And I can get all the html text, but when I was trying to convert it to Json, it failed. It always shows "[ValueError] No JSON object could be decoded". But I have already had the text. Why is it no json object?

session = requests.session()
login_data = {'email': email, 'password': password}
header = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36',
    'Host': 'www.lovetvshow.com'
}
# r = session.post('http://www.renren.com/', data=login_data, headers=header)
r = session.get('http://www.lovetvshow.com/',headers=header)
print r
print r.json()

This will yield:

<Response [200]>
Traceback (most recent call last):
  File "C:/Users/Hao/PycharmProjects/WebSpiderTutorial1/WebSpiderTutorial1.py", line 128, in <module>
    requests_session, requests_cookies = create_session()
  File "C:/Users/Hao/PycharmProjects/WebSpiderTutorial1/WebSpiderTutorial1.py", line 104, in create_session
    print r.json()
  File "C:\Python27\lib\site-packages\requests\models.py", line 892, in json
    return complexjson.loads(self.text, **kwargs)
  File "C:\Python27\lib\json\__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "C:\Python27\lib\json\decoder.py", line 365, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Python27\lib\json\decoder.py", line 383, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

Any suggestions? Thanks a head.

Answer 1

You have to make sure there is JSON to be decoded. Check the complete text using print print r.text . And look for your json