Trying to convert string to json in python - python

I am new to python and I am pretty sure that I am doing something very stupid..
I have a string:
s = '{"l":1,"oE":{"n":"name","rN":["1","2","3","3","5","6","7","8","9","10"],"dir":"out","ed":["1","1","1","1","1","1","1","1","1","1"]}'
I did json.loads(s)
But I am getting an error?
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/json/__init__.py", line 328, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 365, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 381, in raw_decode
obj, end = self.scan_once(s, idx)
ValueError: Expecting , delimiter: line 1 column 72 (char 72)

You're missing a quotation mark in your code. Also a closing brace. Instead of:
s = '{"l":1,"oE":{"n":"name","rN":["1","2","3","3","5","6","7","8","9","10],"dir":"out","ed":["1","1","1","1","1","1","1","1","1","1"]}'
use
s = '{"l":1,"oE":{"n":"name","rN":["1","2","3","3","5","6","7","8","9","10"],"dir":"out","ed":["1","1","1","1","1","1","1","1","1","1"]}}'
You can figure this out from your stack trace:
ValueError: Expecting , delimiter: line 1 column 72 (char 72)
If you look at the 72nd character in that line, you'll see that's where the error occurs.

"10] seems to be missing a ". Try "10"] instead.

Related

Give two different outputs in Thonny and Trinket. (python)

Following code was used in Thonny (offline) IDE and it works fine. But when I use the same code in trinket it gives me an error. What could be the reason?
def compare_prices(product_laughs,product_glomark):
html_lau=requests.get(product_laughs).content
html_glo=requests.get(product_glomark).content #get the content of the site
soup_lau=BeautifulSoup(html_lau,'html.parser')
soup_glo=BeautifulSoup(html_glo,'html.parser')
glo_products=soup_glo.find("script", type="application/ld+json")
glomark_content=glo_products.text #glomark product list
print(glomark_content)
productList=json.loads(glomark_content)
This last statement gives the following error
Traceback (most recent call last):
File "/tmp/sessions/96aa9a060805dc3c/main.py", line 4, in <module>
compare_prices(laughs_coconut,glomark_coconut)
File "/tmp/sessions/96aa9a060805dc3c/compare_prices.py", line 27, in compare_prices
productList=json.loads(glomark_content)
File "/usr/lib/python3.9/json/__init__.py", line 346, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.9/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python3.9/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)

remove function wrapper with str.replace() in Python

I have some annoying elements in a JSON file that go something like:
"DateTime" : Date(-62135596800000),
"ReceivedDateTime" : Date(-62135596800000)
where serialising this using json.Load() results in an error because Date() is unrecognized.
Traceback (most recent call last):
File "json_parse.py", line 10, in <module>
data = json.load(data_file)
File "C:\Python27\lib\json\__init__.py", line 291, in load
**kw)
File "C:\Python27\lib\json\__init__.py", line 339, in loads
return _default_decoder.decode(s)
File "C:\Python27\lib\json\decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "C:\Python27\lib\json\decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
so the easiest thing to do is to remove the Date() wrapper before serialising. I can then convert to proper datetime afterwards.
I can do simple things with str.replace such as:
data.replace("Date(","")
but obviously I am not removing the trailing bracket.
How might I go about doing this?
Cheers.
The more readable way would be to use re library and create regex:
import re
text = '''"DateTime" : Date(-62135596800000),
"ReceivedDateTime" : Date(-62135596800000)'''
pattern = re.compile("Date\((.+)\)")
x = pattern.findall(text)
text2 = text
for i in x:
text2 = text2.replace("Date("+i+")", i)
I wrote this code for you, it should solve the problem.
a = '''"DateTime" : Date(-62135596800000),
"ReceivedDateTime" : Date(-62135596800000)'''
while "Date(" in a: a = (a[:a.index("Date(")+len("Date(")+a[a.index("Date(")+len("Date("):].index(")")] + a[a.index("Date(")+len("Date(")+a[a.index("Date(")+len("Date("):].index(")")+1:]).replace("Date(", "", 1)

Expecting value: line 1 column 2 (char 1)

I have scraped some html and want to create a json doc. Here is the code I currently have:
with open(path.join(path.abspath(path.curdir),'Results\\html.txt'), 'r') as file:
for line in file.readlines():
if not line.strip():
continue
if re.findall(r'\"aggregateRating.*\"telephone\"',line):
reviews = re.findall(r'\[.*\]', line)
json_data = json.loads(str(reviews))
The error I get is: json.decoder.JSONDecodeError: Expecting value: line 1 column 2 (char 1)
Any help is appreciate. I have been stuck on this for awhile..
Your code is trying to load the string representation of a list as a valid json string; which of course will not work.
It is the same as trying to do this:
>>> json.loads(str(['hello world']))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.5/json/__init__.py", line 319, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.5/json/decoder.py", line 339, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python3.5/json/decoder.py", line 357, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 2 (char 1)
If you are trying to write the result as json; you need to do the opposite of loads, which is dumps:
>>> json.dumps(str(['hello world']))
'"[\'hello world\']"'

Issue in reading JSON file in python

>>> import json
>>> d2 = json.loads(open("t.json").read())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python2.6/json/__init__.py", line 307, in loads
return _default_decoder.decode(s)
File "/usr/lib64/python2.6/json/decoder.py", line 319, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python2.6/json/decoder.py", line 336, in raw_decode
obj, end = self._scanner.iterscan(s, **kw).next()
File "/usr/lib64/python2.6/json/scanner.py", line 55, in iterscan
rval, next_pos = action(m, context)
File "/usr/lib64/python2.6/json/decoder.py", line 185, in JSONObject
raise ValueError(errmsg("Expecting object", s, end))
ValueError: Expecting object: line 1 column 11 (char 11)
[ RHEL - ~/testing ]$ cat t.json
{"us": u"OFF", "val": u"5"}
Here is what I have in my JSON file and when I try to read it using open and json.load and json.loads it fails.
After using json.load
>>> import json
>>> d2 = json.load(open("t.json"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python2.6/json/__init__.py", line 267, in load
parse_constant=parse_constant, **kw)
File "/usr/lib64/python2.6/json/__init__.py", line 307, in loads
return _default_decoder.decode(s)
File "/usr/lib64/python2.6/json/decoder.py", line 319, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python2.6/json/decoder.py", line 336, in raw_decode
obj, end = self._scanner.iterscan(s, **kw).next()
File "/usr/lib64/python2.6/json/scanner.py", line 55, in iterscan
rval, next_pos = action(m, context)
File "/usr/lib64/python2.6/json/decoder.py", line 185, in JSONObject
raise ValueError(errmsg("Expecting object", s, end))
ValueError: Expecting object: line 1 column 11 (char 11)
>>>
You are using the wrong function. Use json.load() (no s!) to load data from an open file object:
d2 = json.load(open("t.json"))
The json.loads() function expects you to pass in a string, not a file object. You'd have to read your file in that case, returning the read data:
d2 = json.loads(open("t.json").read())
Next, you have invalid JSON in that file:
{"us": u"OFF", "val": u"5"}
# ^ ^
JSON is not Python; those u prefixes are not supported nor needed. You'll need to remove those from the file before it'll load.
If you have an API producing that format, it is not giving you JSON. It could be that it is producing a (strange form of) Python syntax instead; Python itself would produce {'us': u'OFF', 'val': u'5'} (single quotes). You can have Python interpret that as Python literals with ast.literal_eval():
import ast
with open('t.json') as fileobj:
d2 = ast.literal_eval(fileobj.read())
but it could be that the format is broken in other ways we cannot determine from a single isolated sample. It could be using true and false for boolean values, like in JSON, for example.
Better to have the API fixed rather that try and work around this broken-ness.
You are using the json.loads method. More documentation here. This method is used for string arguments only. Luckily, there is a similarly named json.load method documented here. This one can be used directly on a file object.
d2 = json.load(open("t.json"))
Your issue is that the JSON is not valid.
It looks like it is a python dictionnary. u'string' is a python 2 unicode string.
If you remove the u from your strings, it works fine.
>>> import json
>>> json.load(open('i.json'))
{u'val': u'5', u'us': u'OFF'}
Here is the json file:
$ cat i.json
{"us": "OFF", "val": "5"}

Python read multiline JSON

I have been trying to use JSON to store settings for a program. I can't seem to get Python 2.6 's JSON Decoder to decode multi-line JSON strings...
Here is example input:
.settings file:
"""
{\
'user':'username',\
'password':'passwd',\
}\
"""
I have tried a couple other syntaxes for this file, which I will specify below (with the traceback they cause).
My python code for reading the file in is
import json
settings_text = open(".settings", "r").read()
settings = json.loads(settings_text)
The Traceback for this is:
Traceback (most recent call last):
File "json_test.py", line 4, in <module>
print json.loads(text)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/__init__.py", line 307, in loads
return _default_decoder.decode(s)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 322, in decode
raise ValueError(errmsg("Extra data", s, end, len(s)))
ValueError: Extra data: line 1 column 2 - line 7 column 1 (char 2 - 41)
I assume the "Extra data" is the triple-quote.
Here are the other syntaxes I have tried for the .settings file, with their respective Tracebacks:
"{\
'user':'username',\
'pass':'passwd'\
}"
Traceback (most recent call last):
File "json_test.py", line 4, in <module>
print json.loads(text)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/__init__.py", line 307, in loads
return _default_decoder.decode(s)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 319, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 336, in raw_decode
obj, end = self._scanner.iterscan(s, **kw).next()
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/scanner.py", line 55, in iterscan
rval, next_pos = action(m, context)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 155, in JSONString
return scanstring(match.string, match.end(), encoding, strict)
ValueError: Invalid \escape: line 1 column 2 (char 2)
'{\
"user":"username",\
"pass":"passwd",\
}'
Traceback (most recent call last):
File "json_test.py", line 4, in <module>
print json.loads(text)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/__init__.py", line 307, in loads
return _default_decoder.decode(s)
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 319, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 338, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
If I put the settings all on one line, it decodes fine.
Get rid of all of the backslashes and all of the "Pythonic" quoting in the settings file. Works fine if the file is just:
{
"user":"username",
"password":"passwd"
}
Note also that JSON strings are quoted with double quotes, not single quotes. See JSON spec here:
http://www.json.org/
>>> s = """
{
"user":"username",
"password":"passwd"
}
"""
>>> json.loads(s)
{'password': 'passwd', 'user': 'username'}
json doesn't consider \ to be a line-continuation character.
Try to use eval(s)
s="""
{\
'user':'username',\
'password':'passwd',\
\
"""
ss=eval(q)
qq
{'password': 'passwd', 'user': 'username'}
type(qq)
dict

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