我得到错误期望值:第1行第1列(字符0)时试图解码JSON。
我用于API调用的URL在浏览器中工作正常，但在通过curl请求完成时给出了这个错误。下面是我用于curl请求的代码。
错误发生在返回simplejson.loads(response_json)时
response_json = self.web_fetch(url)
response_json = response_json.decode('utf-8')
return json.loads(response_json)
def web_fetch(self, url):
buffer = StringIO()
curl = pycurl.Curl()
curl.setopt(curl.URL, url)
curl.setopt(curl.TIMEOUT, self.timeout)
curl.setopt(curl.WRITEFUNCTION, buffer.write)
curl.perform()
curl.close()
response = buffer.getvalue().strip()
return response
回溯:
File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
111. response = callback(request, *callback_args, **callback_kwargs)
File "/Users/nab/Desktop/pricestore/pricemodels/views.py" in view_category
620. apicall=api.API().search_parts(category_id= str(categoryofpart.api_id), manufacturer = manufacturer, filter = filters, start=(catpage-1)*20, limit=20, sort_by='[["mpn","asc"]]')
File "/Users/nab/Desktop/pricestore/pricemodels/api.py" in search_parts
176. return simplejson.loads(response_json)
File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/__init__.py" in loads
455. return _default_decoder.decode(s)
File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/decoder.py" in decode
374. obj, end = self.raw_decode(s)
File "/Users/nab/Desktop/myenv2/lib/python2.7/site-packages/simplejson/decoder.py" in raw_decode
393. return self.scan_once(s, idx=_w(s, idx).end())
Exception Type: JSONDecodeError at /pricemodels/2/dir/
Exception Value: Expecting value: line 1 column 1 (char 0)
很多时候，这是因为你试图解析的字符串是空的:
>>> import json
>>> x = json.loads("")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/__init__.py", line 348, in loads
return _default_decoder.decode(s)
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
你可以通过事先检查json_string是否为空来补救:
import json
if json_string:
x = json.loads(json_string)
else:
# Your code/logic here
x = {}
很多时候，这是因为你试图解析的字符串是空的:
>>> import json
>>> x = json.loads("")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/__init__.py", line 348, in loads
return _default_decoder.decode(s)
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
你可以通过事先检查json_string是否为空来补救:
import json
if json_string:
x = json.loads(json_string)
else:
# Your code/logic here
x = {}
检查响应数据体，是否有实际数据，数据转储格式是否正确。
在大多数情况下，你的json。JSONDecodeError:期望值:第1行第1列(字符0)错误是由于:
非json格式引用
XML/HTML输出(即以<开头的字符串)，或
不兼容的字符编码
最终，该错误告诉您，在第一个位置，字符串已经不符合JSON。
因此，如果解析失败，尽管有一个乍一看像JSON的数据体，尝试替换数据体的引号:
import sys, json
struct = {}
try:
try: #try parsing to dict
dataform = str(response_json).strip("'<>() ").replace('\'', '\"')
struct = json.loads(dataform)
except:
print repr(resonse_json)
print sys.exc_info()
注意:数据中的引号必须正确转义
当你想在python中加载json文件时，这是我发现的最简单的解决方案
import json
data = json.load(open('file_name.json'))
如果给出错误，表示字符在X和Y位置不匹配，则只需在左圆括号内添加encoding='utf-8'
data = json.load(open('file_name.json', encoding='utf-8'))
解释
Open打开文件并读取稍后在json.load中解析的包含。
请注意，使用与open()作为f比上述语法更可靠，因为它确保文件在执行后关闭，完整的语法将是
with open('file_name.json') as f:
data = json.load(f)
