Re: Parsing / Deserializing a JSON String

[Eric]

As I have been receiving all along, the code you suggested gives me
the following error:

"
TypeError at /course/savegantt/

string indices must be integers
"

There must be something not quite right about the for loop statement
("for obj in serializers.deserialize('json', gantt_data): ")



On Sep 6, 3:42 pm, "J. Clifford Dyer"  wrote:
> On Sat, 2009-09-05 at 16:12 -0700, Eric wrote:
> > Thank you for your input.  I tried what you suggested by first just
> > trying to loop through the data like so:
>
> > "
> > test_output = 0
> > for obj in serializers.deserialize('json', gantt_data)['ganttgroups']:
> >     test_output = test_output + 1
> > "
>
> > This generated the following error:
>
> >      "'generator' object is unsubscriptable"
>
> Huh.  Okay.  I didn't realize deserialize would return a generator.
>
> > I tried changing it slightly,  moving "['ganttgroups']" inside the
> > brackets, to this:
>
> > "
> > test_test_output = 0
> > for obj in serializers.deserialize('json', gantt_data['ganttgroups']):
> >     test_output = test_output + 1
> > "
>
> > This generated the error I originally received:
>
> >     "string indices must be integers"
>
> Yes.  Now you're trying to subscript gantt_data before you deserialize
> it.  As you know, gantt_data is a json string.  Hence the error.
>
> > I am just so new to this that I'm not sure where to go from here. Do
> > you have any other suggestions as to what I may be doing wrong?
> > Again, any help with this would be greatly appreciated.
>
> Well, the first thing you need to do is figure out what you have to work
> with.  You know now that deserializer returns a generator, so try
> looping over it to see what it yields each time around:
>
> for obj in serializers.deserialize('json', gantt_data):
>     print '---'
>     print type(obj)
>     print obj
>
> That should give you a hint how to proceed.  If you need more clues,
> then add:
>
>     print dir(obj)
>     print help(obj)
>
> That will give you some hints as to what you can do with obj.
>
>
>
> > On Sep 3, 1:09 pm, "J. Cliff Dyer"  wrote:
> > > I suspect your error is hiding in .  What do you expect
> > > obj to be?  Your JSON should return a big dictionary with one key
> > > ("ganttgroups").  When you iterate over a dictionary in python, you get
> > > the keys of that dictionary.  In this case, the string "ganttgroups".
> > > You may be doing the following:
>
> > > for obj in serializers.deserialize("json", gantt_data):
> > >     do_something_to(obj['gantts'])
>
> > > which returns an error, because it evaluates to "ganttgroups"['gantts']
> > > (which would give you the error you see.
>
> > > What you want is more like:
>
> > > for obj in serializers.deserialize('json', gantt_data)['ganttgroups']:
> > >     start = obj['start']
> > >     for gantt in obj['gantts']:
> > >         for row in gantt['rows']:
> > >             print row['own']
>
> > > In short, you're getting your dicts and lists mixed up, or your keys and
> > > values.
>
> > > Cheers,
> > > Cliff
>
> > > On Wed, 2009-09-02 at 10:40 -0700, Eric wrote:
> > > > I forgot to mention that I am trying to deserialize the data as
> > > > follows:
>
> > > > "
> > > > ...
> > > > gantt_data = request.POST.get('ganttdata')
>
> > > > for obj in serializers.deserialize("json", gantt_data):
> > > >     
> > > > ...
> > > > "
>
> > > > On Sep 2, 10:37 am, Eric  wrote:
> > > > > Hi,
> > > > > I am attempting to parse a json string passed to my view via a form
> > > > > post.   A simple example of my json structure is as follows (indented
> > > > > for readability):
>
> > > > > {
> > > > >     "ganttgroups":[
> > > > >         {
> > > > >             "gantts":[
> > > > >                 {
> > > > >                     "rows":[
> > > > >                         {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > > > > ta1",  "own":"Tim Johnson"},
> > > > >                         {"stt":2, "end":3, "ttl":"my row (g1 t2)",
> > > > > "own":"John Doe"},
> > > > >                         {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > > > > ta3", "own":"Mary Smith"}
> > > > >                     ]
> > > > >                 },
> > > > >                 {
> > > > >                     "rows":[
> > > > >                         {"stt":1, "end":2, "ttl":"My 4th task",
> > > > > "own":"Eric Johnson"},
> > > > >                         {"stt":1, "end":2, "ttl":"my row (g2 t2)",
> > > > > "own":"Jeff Smith"},
> > > > >                         {"stt":1, "end":2, "ttl":"test row - gr1 ga2
> > > > > t3", "own":"Bill Baker"}
> > > > >                     ]
> > > > >                 }
> > > > >             ],
> > > > >             "start":"2009-1-01"
> > > > >         }
> > > > >         ,{
> > > > >             "gantts":[
> > > > >                 {
> > > > >                     "rows":[
> > > > >                         {"stt":1, "end":2, "ttl":"row - gr2 ga1 t1",
> > > > > "own":"Ted Tillman"},
> > > > >     

Re: Parsing / Deserializing a JSON String

[J. Clifford Dyer]

On Sat, 2009-09-05 at 16:12 -0700, Eric wrote:
> Thank you for your input.  I tried what you suggested by first just
> trying to loop through the data like so:
> 
> "
> test_output = 0
> for obj in serializers.deserialize('json', gantt_data)['ganttgroups']:
> test_output = test_output + 1
> "
> 
> This generated the following error:
> 
>  "'generator' object is unsubscriptable"
> 

Huh.  Okay.  I didn't realize deserialize would return a generator.

> I tried changing it slightly,  moving "['ganttgroups']" inside the
> brackets, to this:
> 
> "
> test_test_output = 0
> for obj in serializers.deserialize('json', gantt_data['ganttgroups']):
> test_output = test_output + 1
> "
> 
> This generated the error I originally received:
> 
> "string indices must be integers"
> 

Yes.  Now you're trying to subscript gantt_data before you deserialize
it.  As you know, gantt_data is a json string.  Hence the error.

> I am just so new to this that I'm not sure where to go from here. Do
> you have any other suggestions as to what I may be doing wrong?
> Again, any help with this would be greatly appreciated.
> 

Well, the first thing you need to do is figure out what you have to work
with.  You know now that deserializer returns a generator, so try
looping over it to see what it yields each time around: 

for obj in serializers.deserialize('json', gantt_data):
print '---'
print type(obj) 
print obj

That should give you a hint how to proceed.  If you need more clues,
then add:

print dir(obj)
print help(obj)

That will give you some hints as to what you can do with obj.


> 
> 
> 
> On Sep 3, 1:09 pm, "J. Cliff Dyer"  wrote:
> > I suspect your error is hiding in .  What do you expect
> > obj to be?  Your JSON should return a big dictionary with one key
> > ("ganttgroups").  When you iterate over a dictionary in python, you get
> > the keys of that dictionary.  In this case, the string "ganttgroups".
> > You may be doing the following:
> >
> > for obj in serializers.deserialize("json", gantt_data):
> > do_something_to(obj['gantts'])
> >
> > which returns an error, because it evaluates to "ganttgroups"['gantts']
> > (which would give you the error you see.
> >
> > What you want is more like:
> >
> > for obj in serializers.deserialize('json', gantt_data)['ganttgroups']:
> > start = obj['start']
> > for gantt in obj['gantts']:
> > for row in gantt['rows']:
> > print row['own']
> >
> > In short, you're getting your dicts and lists mixed up, or your keys and
> > values.
> >
> > Cheers,
> > Cliff
> >
> > On Wed, 2009-09-02 at 10:40 -0700, Eric wrote:
> > > I forgot to mention that I am trying to deserialize the data as
> > > follows:
> >
> > > "
> > > ...
> > > gantt_data = request.POST.get('ganttdata')
> >
> > > for obj in serializers.deserialize("json", gantt_data):
> > > 
> > > ...
> > > "
> >
> > > On Sep 2, 10:37 am, Eric  wrote:
> > > > Hi,
> > > > I am attempting to parse a json string passed to my view via a form
> > > > post.   A simple example of my json structure is as follows (indented
> > > > for readability):
> >
> > > > {
> > > > "ganttgroups":[
> > > > {
> > > > "gantts":[
> > > > {
> > > > "rows":[
> > > > {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > > > ta1",  "own":"Tim Johnson"},
> > > > {"stt":2, "end":3, "ttl":"my row (g1 t2)",
> > > > "own":"John Doe"},
> > > > {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > > > ta3", "own":"Mary Smith"}
> > > > ]
> > > > },
> > > > {
> > > > "rows":[
> > > > {"stt":1, "end":2, "ttl":"My 4th task",
> > > > "own":"Eric Johnson"},
> > > > {"stt":1, "end":2, "ttl":"my row (g2 t2)",
> > > > "own":"Jeff Smith"},
> > > > {"stt":1, "end":2, "ttl":"test row - gr1 ga2
> > > > t3", "own":"Bill Baker"}
> > > > ]
> > > > }
> > > > ],
> > > > "start":"2009-1-01"
> > > > }
> > > > ,{
> > > > "gantts":[
> > > > {
> > > > "rows":[
> > > > {"stt":1, "end":2, "ttl":"row - gr2 ga1 t1",
> > > > "own":"Ted Tillman"},
> > > > {"stt":1, "end":2, "ttl":"row - gr2 ga1 t2",
> > > > "own":"Kim Crane"},
> > > > {"stt":1, "end":2, "ttl":"row - gr2 ga1 t3",
> > > > "own":"Bob Barker"}
> > > > ]
> > > > }
> > > > ],
> > > > "start":"2009-1-01"
> > > > }
> > > > ]
> >
> > > > }
> >
> > > > I would like to parse it so that I can loop over the pairs/arrays to
> > > > access the data. When I try to deserialize the data, I get the django
> > > > error 

Re: Parsing / Deserializing a JSON String

[Eric]

Thank you for your input.  I tried what you suggested by first just
trying to loop through the data like so:

"
test_output = 0
for obj in serializers.deserialize('json', gantt_data)['ganttgroups']:
test_output = test_output + 1
"

This generated the following error:

 "'generator' object is unsubscriptable"

I tried changing it slightly,  moving "['ganttgroups']" inside the
brackets, to this:

"
test_test_output = 0
for obj in serializers.deserialize('json', gantt_data['ganttgroups']):
test_output = test_output + 1
"

This generated the error I originally received:

"string indices must be integers"

I am just so new to this that I'm not sure where to go from here. Do
you have any other suggestions as to what I may be doing wrong?
Again, any help with this would be greatly appreciated.




On Sep 3, 1:09 pm, "J. Cliff Dyer"  wrote:
> I suspect your error is hiding in .  What do you expect
> obj to be?  Your JSON should return a big dictionary with one key
> ("ganttgroups").  When you iterate over a dictionary in python, you get
> the keys of that dictionary.  In this case, the string "ganttgroups".
> You may be doing the following:
>
> for obj in serializers.deserialize("json", gantt_data):
>     do_something_to(obj['gantts'])
>
> which returns an error, because it evaluates to "ganttgroups"['gantts']
> (which would give you the error you see.
>
> What you want is more like:
>
> for obj in serializers.deserialize('json', gantt_data)['ganttgroups']:
>     start = obj['start']
>     for gantt in obj['gantts']:
>         for row in gantt['rows']:
>             print row['own']
>
> In short, you're getting your dicts and lists mixed up, or your keys and
> values.
>
> Cheers,
> Cliff
>
> On Wed, 2009-09-02 at 10:40 -0700, Eric wrote:
> > I forgot to mention that I am trying to deserialize the data as
> > follows:
>
> > "
> > ...
> > gantt_data = request.POST.get('ganttdata')
>
> > for obj in serializers.deserialize("json", gantt_data):
> >     
> > ...
> > "
>
> > On Sep 2, 10:37 am, Eric  wrote:
> > > Hi,
> > > I am attempting to parse a json string passed to my view via a form
> > > post.   A simple example of my json structure is as follows (indented
> > > for readability):
>
> > > {
> > >     "ganttgroups":[
> > >         {
> > >             "gantts":[
> > >                 {
> > >                     "rows":[
> > >                         {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > > ta1",  "own":"Tim Johnson"},
> > >                         {"stt":2, "end":3, "ttl":"my row (g1 t2)",
> > > "own":"John Doe"},
> > >                         {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > > ta3", "own":"Mary Smith"}
> > >                     ]
> > >                 },
> > >                 {
> > >                     "rows":[
> > >                         {"stt":1, "end":2, "ttl":"My 4th task",
> > > "own":"Eric Johnson"},
> > >                         {"stt":1, "end":2, "ttl":"my row (g2 t2)",
> > > "own":"Jeff Smith"},
> > >                         {"stt":1, "end":2, "ttl":"test row - gr1 ga2
> > > t3", "own":"Bill Baker"}
> > >                     ]
> > >                 }
> > >             ],
> > >             "start":"2009-1-01"
> > >         }
> > >         ,{
> > >             "gantts":[
> > >                 {
> > >                     "rows":[
> > >                         {"stt":1, "end":2, "ttl":"row - gr2 ga1 t1",
> > > "own":"Ted Tillman"},
> > >                         {"stt":1, "end":2, "ttl":"row - gr2 ga1 t2",
> > > "own":"Kim Crane"},
> > >                         {"stt":1, "end":2, "ttl":"row - gr2 ga1 t3",
> > > "own":"Bob Barker"}
> > >                     ]
> > >                 }
> > >             ],
> > >             "start":"2009-1-01"
> > >         }
> > >     ]
>
> > > }
>
> > > I would like to parse it so that I can loop over the pairs/arrays to
> > > access the data. When I try to deserialize the data, I get the django
> > > error "string indices must be integers". Can anybody please help me
> > > determine what exactly this means and how I may fix this?  Is there
> > > another method I should be using? I am obviously a bit of a newbie at
> > > this so any help would be greatly appreciated.
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Re: Parsing / Deserializing a JSON String

[J. Cliff Dyer]

I suspect your error is hiding in .  What do you expect
obj to be?  Your JSON should return a big dictionary with one key
("ganttgroups").  When you iterate over a dictionary in python, you get
the keys of that dictionary.  In this case, the string "ganttgroups".
You may be doing the following:

for obj in serializers.deserialize("json", gantt_data):
do_something_to(obj['gantts'])

which returns an error, because it evaluates to "ganttgroups"['gantts']
(which would give you the error you see.

What you want is more like:

for obj in serializers.deserialize('json', gantt_data)['ganttgroups']:
start = obj['start']
for gantt in obj['gantts']:
for row in gantt['rows']:
print row['own']

In short, you're getting your dicts and lists mixed up, or your keys and
values.

Cheers,
Cliff


On Wed, 2009-09-02 at 10:40 -0700, Eric wrote:
> I forgot to mention that I am trying to deserialize the data as
> follows:
> 
> "
> ...
> gantt_data = request.POST.get('ganttdata')
> 
> for obj in serializers.deserialize("json", gantt_data):
> 
> ...
> "
> 
> On Sep 2, 10:37 am, Eric  wrote:
> > Hi,
> > I am attempting to parse a json string passed to my view via a form
> > post.   A simple example of my json structure is as follows (indented
> > for readability):
> >
> > {
> > "ganttgroups":[
> > {
> > "gantts":[
> > {
> > "rows":[
> > {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > ta1",  "own":"Tim Johnson"},
> > {"stt":2, "end":3, "ttl":"my row (g1 t2)",
> > "own":"John Doe"},
> > {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> > ta3", "own":"Mary Smith"}
> > ]
> > },
> > {
> > "rows":[
> > {"stt":1, "end":2, "ttl":"My 4th task",
> > "own":"Eric Johnson"},
> > {"stt":1, "end":2, "ttl":"my row (g2 t2)",
> > "own":"Jeff Smith"},
> > {"stt":1, "end":2, "ttl":"test row - gr1 ga2
> > t3", "own":"Bill Baker"}
> > ]
> > }
> > ],
> > "start":"2009-1-01"
> > }
> > ,{
> > "gantts":[
> > {
> > "rows":[
> > {"stt":1, "end":2, "ttl":"row - gr2 ga1 t1",
> > "own":"Ted Tillman"},
> > {"stt":1, "end":2, "ttl":"row - gr2 ga1 t2",
> > "own":"Kim Crane"},
> > {"stt":1, "end":2, "ttl":"row - gr2 ga1 t3",
> > "own":"Bob Barker"}
> > ]
> > }
> > ],
> > "start":"2009-1-01"
> > }
> > ]
> >
> > }
> >
> > I would like to parse it so that I can loop over the pairs/arrays to
> > access the data. When I try to deserialize the data, I get the django
> > error "string indices must be integers". Can anybody please help me
> > determine what exactly this means and how I may fix this?  Is there
> > another method I should be using? I am obviously a bit of a newbie at
> > this so any help would be greatly appreciated.
> > 


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Re: Parsing / Deserializing a JSON String

[Eric]

Here is a raw example of the json.. Note that it is a different
example than above:

{"ganttgroups":[{"gantts":[{"rows":[{"stt":1,"end":2,"ttl":"wash
dog","own":"Joe"},{"stt":2,"end":3,"ttl":"clean house"},{"stt":3,"end":
5,"ttl":"sell couch","own":"Mary"}]},{"rows":[{"stt":1,"end":
5,"ttl":"eat diner"},{"stt":5,"end":7,"ttl":"frame","own":"Ed"},{"stt":
6,"end":10,"ttl":"the rest","own":"Chris"}]}],"start":"2009-1-01"},
{"gantts":[{"rows":[{"stt":3,"end":5,"ttl":"1st try","own":"Bill"},
{"stt":5,"end":9,"ttl":"2nd try","own":"Jeff"},{"stt":9,"end":
12,"ttl":"3rd try"}]}],"start":"2009-1-01"}]}

On Sep 2, 11:30 am, Andrew McGregor  wrote:
> On Wed, Sep 2, 2009 at 6:47 PM, Eric wrote:
>
> > Im using the Django deserialization method shown here:
>
> >http://docs.djangoproject.com/en/dev/topics/serialization/
>
> ok, try pasting your json (the original, not your re-typed version) here:
>
> http://www.jsonlint.com/
>
> --
> Andrew McGregor
> 07940 22 33 11
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Re: Parsing / Deserializing a JSON String

[Andrew McGregor]

On Wed, Sep 2, 2009 at 6:47 PM, Eric wrote:
>
> Im using the Django deserialization method shown here:
>
> http://docs.djangoproject.com/en/dev/topics/serialization/
>

ok, try pasting your json (the original, not your re-typed version) here:

http://www.jsonlint.com/

-- 
Andrew McGregor
07940 22 33 11

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Re: Parsing / Deserializing a JSON String

[Andrew McGregor]

> I would like to parse it so that I can loop over the pairs/arrays to
> access the data. When I try to deserialize the data, I get the django
> error "string indices must be integers". Can anybody please help me
> determine what exactly this means and how I may fix this?  Is there
> another method I should be using? I am obviously a bit of a newbie at
> this so any help would be greatly appreciated.

Are you manually deserialising the data?

http://pypi.python.org/pypi/simplejson/

-- 
Andrew McGregor
07940 22 33 11

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Re: Parsing / Deserializing a JSON String

[Javier Guerra]

On Wed, Sep 2, 2009 at 12:37 PM, Eric wrote:
>When I try to deserialize the data, I get the django
> error "string indices must be integers"

it's not on your example, but i guess you're missing a colon between a
fieldname and an array, something like this:

{"gantts"[{"rows".

instead of

{"gantts":[{"rows".



-- 
Javier

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Re: Parsing / Deserializing a JSON String

[Eric]

Im using the Django deserialization method shown here:

http://docs.djangoproject.com/en/dev/topics/serialization/

It goes something like:

"
...
gantt_data = request.POST.get('ganttdata')

for obj in serializers.deserialize("json", gantt_data):

...
"


On Sep 2, 10:41 am, Andrew McGregor  wrote:
> > I would like to parse it so that I can loop over the pairs/arrays to
> > access the data. When I try to deserialize the data, I get the django
> > error "string indices must be integers". Can anybody please help me
> > determine what exactly this means and how I may fix this?  Is there
> > another method I should be using? I am obviously a bit of a newbie at
> > this so any help would be greatly appreciated.
>
> Are you manually deserialising the data?
>
> http://pypi.python.org/pypi/simplejson/
>
> --
> Andrew McGregor
> 07940 22 33 11
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Re: Parsing / Deserializing a JSON String

[Eric]

I forgot to mention that I am trying to deserialize the data as
follows:

"
...
gantt_data = request.POST.get('ganttdata')

for obj in serializers.deserialize("json", gantt_data):

...
"

On Sep 2, 10:37 am, Eric  wrote:
> Hi,
> I am attempting to parse a json string passed to my view via a form
> post.   A simple example of my json structure is as follows (indented
> for readability):
>
> {
>     "ganttgroups":[
>         {
>             "gantts":[
>                 {
>                     "rows":[
>                         {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> ta1",  "own":"Tim Johnson"},
>                         {"stt":2, "end":3, "ttl":"my row (g1 t2)",
> "own":"John Doe"},
>                         {"stt":1, "end":2, "ttl":"test row - gr1 ga1
> ta3", "own":"Mary Smith"}
>                     ]
>                 },
>                 {
>                     "rows":[
>                         {"stt":1, "end":2, "ttl":"My 4th task",
> "own":"Eric Johnson"},
>                         {"stt":1, "end":2, "ttl":"my row (g2 t2)",
> "own":"Jeff Smith"},
>                         {"stt":1, "end":2, "ttl":"test row - gr1 ga2
> t3", "own":"Bill Baker"}
>                     ]
>                 }
>             ],
>             "start":"2009-1-01"
>         }
>         ,{
>             "gantts":[
>                 {
>                     "rows":[
>                         {"stt":1, "end":2, "ttl":"row - gr2 ga1 t1",
> "own":"Ted Tillman"},
>                         {"stt":1, "end":2, "ttl":"row - gr2 ga1 t2",
> "own":"Kim Crane"},
>                         {"stt":1, "end":2, "ttl":"row - gr2 ga1 t3",
> "own":"Bob Barker"}
>                     ]
>                 }
>             ],
>             "start":"2009-1-01"
>         }
>     ]
>
> }
>
> I would like to parse it so that I can loop over the pairs/arrays to
> access the data. When I try to deserialize the data, I get the django
> error "string indices must be integers". Can anybody please help me
> determine what exactly this means and how I may fix this?  Is there
> another method I should be using? I am obviously a bit of a newbie at
> this so any help would be greatly appreciated.
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