JSONDecodeError: Expecting value: line 1 column 1 (char 0)

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在尝试从'http://kuaidi100.com/query'获取数据时遇到JSONDecodeError，错误显示在第1行第1列。问题可能由于URL缺少'www'前缀导致，检查并修正URL后重新尝试。

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JSONDecodeError                           Traceback (most recent call last)
<ipython-input-8-c6de33151325> in <module>()
     11 url_visit='http://kuaidi100.com/query?type=shentong&postid={}'.format(postid)
     12 crawl_content=urlrequest.urlopen(url_visit).read()
---> 13 json_content=json.loads(crawl_content.decode("utf8"))
     14 i=0
     15 for i in 10:

~\AppData\Local\conda\conda\envs\course_py35\lib\json\__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    317             parse_int is None and parse_float is None and
    318             parse_constant is None and object_pairs_hook is None and not kw):
--> 319         return _default_decoder.decode(s)
    320     if cls is None:
    321         cls = JSONDecoder

~\AppData\Local\conda\conda\envs\course_py35\lib\json\decoder.py in decode(self, s, _w)
    337 
    338         """
--> 339         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    340         end = _w(s, end).end()
    341         if end != len(s):

~\AppData\Local\conda\conda\envs\course_py35\lib\json\decoder.py in raw_decode(self, s, idx)
    355             obj, end = self.scan_once(s, idx)
    356         except StopIteration as err:
--> 357             raise JSONDecodeError("Expecting value", s, err.value) from None
    358         return obj, end

JSONDecodeError: Expecting value: line 1 column 1 (char 0)


原因 ， url_visit='http://www.kuaidi100.com/query?type=shentong&postid={}'.format(postid)  我少些了WWW
先去把网址看一下是否可用再说