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json.loads errors out on valid JSON #65381

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YakovKeselman mannequin opened this issue Apr 8, 2014 · 3 comments
Closed

json.loads errors out on valid JSON #65381

YakovKeselman mannequin opened this issue Apr 8, 2014 · 3 comments
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stdlib Python modules in the Lib dir

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@YakovKeselman
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Mannequin

YakovKeselman mannequin commented Apr 8, 2014

BPO 21182
Nosy @4kir4, @kushaldas

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = <Date 2014-04-09.19:38:55.181>
created_at = <Date 2014-04-08.23:42:13.544>
labels = ['invalid', 'library']
title = 'json.loads errors out on valid JSON'
updated_at = <Date 2014-04-09.19:38:55.179>
user = 'https://bugs.python.org/YakovKeselman'

bugs.python.org fields:

activity = <Date 2014-04-09.19:38:55.179>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2014-04-09.19:38:55.181>
closer = 'ned.deily'
components = ['Library (Lib)']
creation = <Date 2014-04-08.23:42:13.544>
creator = 'Yakov.Keselman'
dependencies = []
files = []
hgrepos = []
issue_num = 21182
keywords = []
message_count = 3.0
messages = ['215780', '215803', '215834']
nosy_count = 3.0
nosy_names = ['akira', 'kushal.das', 'Yakov.Keselman']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue21182'
versions = ['Python 3.1', 'Python 2.7', 'Python 3.2', 'Python 3.3', 'Python 3.4', 'Python 3.5']
@YakovKeselman
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YakovKeselman mannequin commented Apr 8, 2014

Run the following Python JSON parsing script on valid JSON:

import json
json.loads( '["[\"Residential | Furniture | Cabinets\",\"119.99\"]"]' )

Result:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python33\lib\json\__init__.py", line 319, in loads
    return _default_decoder.decode(s)
  File "C:\Python33\lib\json\decoder.py", line 352, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Python33\lib\json\decoder.py", line 368, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Expecting ',' delimiter: line 1 column 5 (char 4)

@YakovKeselman YakovKeselman mannequin added the topic-IO label Apr 8, 2014
@kushaldas
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It is not a valid JSON. You may want to validate it against http://jsonlint.com/

What you have inside the string (single quotes) is the JSON representation but not the string representation which json.loads is supposed to parse.

@4kir4
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4kir4 mannequin commented Apr 9, 2014

You need to escape backslashes inside a Python string literal or use raw-string literals:

  >>> import json
  >>> json.loads(r'["[\"Residential | Furniture | Cabinets\",\"119.99\"]"]')
  [u'["Residential | Furniture | Cabinets","119.99"]']

If the backslashes are unintentional then you could remove them:

  >>> json.loads('[["Residential | Furniture | Cabinets","119.99"]]')
  [[u'Residential | Furniture | Cabinets', u'119.99']]

Note: the result is different

@ned-deily ned-deily added stdlib Python modules in the Lib dir and removed topic-IO labels Apr 9, 2014
@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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