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Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0)

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On 5/9/2016 3:56 PM, zljubisic@gmail.com wrote:
> Hi,
>
> in python3 my variable looks like this:
>
> a = b'{"uuid":"5730e8666ffa02.34177329","error":""}'
> str(a) = 'b\'{"uuid":"5730e8666ffa02.34177329","error":""}\''
>
> If I execute the following command I get the error:
>
>>>> json.loads(str(a))
> Traceback (most recent call last):
>   File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 2016.1.2\helpers\pydev\_pydevd_bundle\pydevd_exec2.py", line 3, in Exec
>     exec(exp, global_vars, local_vars)
>   File "<input>", line 1, in <module>
>   File "C:\Program Files\Python34\lib\json\__init__.py", line 318, in loads
>     return _default_decoder.decode(s)
>   File "C:\Program Files\Python34\lib\json\decoder.py", line 343, in decode
>     obj, end = self.raw_decode(s, idx=_w(s, 0).end())
>   File "C:\Program Files\Python34\lib\json\decoder.py", line 361, in raw_decode
>     raise ValueError(errmsg("Expecting value", s, err.value)) from None
> ValueError: Expecting value: line 1 column 1 (char 0)
>
> Why I am getting this error?
> If I set variable a to the '{"uuid":"5730e8666ffa02.34177329","error":""}' everything works as expected.

This means that the two versions of 'a' are not the same.  So what you 
should have done to debug is print the second to see what you actually 
passed to json.

Editorial: Programming classes should teach basic debugging better. I 
have seen numerous newbie Stackoverflow questions where the person 
should have started with adding a print statement before posting a question.

-- 
Terry Jan Reedy

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json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) zljubisic@gmail.com - 2016-05-09 12:56 -0700
  Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) Peter Otten <__peter__@web.de> - 2016-05-09 22:17 +0200
  Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) MRAB <python@mrabarnett.plus.com> - 2016-05-09 21:21 +0100
  Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-05-09 21:41 +0100
  Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) Terry Reedy <tjreedy@udel.edu> - 2016-05-09 19:07 -0400
    Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) Steven D'Aprano <steve@pearwood.info> - 2016-05-10 12:13 +1000
      Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) Rustom Mody <rustompmody@gmail.com> - 2016-05-09 21:22 -0700
        Re: json.loads(...) ValueError: Expecting value: line 1 column 1 (char 0) zljubisic@gmail.com - 2016-05-10 12:27 -0700

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