Write to file as JSON format?

Question

I have A method for format the output as JSON. My keyword_filter will be pass in this this format:

<QueryDict: {u'customer_type': [u'ABC'], u'tag': [u'2']}>
<QueryDict: {u'customer_type': [u'TDO'], u'tag': [u'3']}>
<QueryDict: {u'customer_type': [u'FRI'], u'tag': [u'2,3']}>

In fact this I got from request.GET (keyword_filter=request.GET)

This is my method: (I am trying)

 def save_fiter_to_JSON(self, dest, keyword_filter):
    fwrite  = open(dest, 'a')
    #keyword_filter = <QueryDict: {u'customer_type': [u'FRI'], u'tag': [u'2,3']}>
    string_input1 =string.replace(str(keyword_filter), '<QueryDict:', '["name:"')
    string_input2 = string.replace(string_input1, '>', '')
    fwrite.write(string_input2+",\n")
    fwrite.close()

The JSON format that I want:

[
 {"name": filter_name, "customer_type": "ABC", "tag": [2,3]},
]

Or the other good one format from you.

import simplejson as json
>>> json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}])
'["foo", {"bar": ["baz", null, 1.0, 2]}]'

filter_name will be passed from the method save_fiter_to_JSON.

Hi python, it's not very clear to me what exactly you want. So you know you can use the simplejson module to write in JSON format. But what is the problem? Is it the fact that you need filter_name to be written without the quotes? (Because it is to be interpreted by JavaScript as an object/function name rather than a string)? — Wim
– Wim, Commented Dec 25, 2009 at 9:50
Yes,In fact I don't use json before.I am trying to format my input <QueryDict: {u'customer_type': [u'FRI'], u'tag': [u'2,3']}> to the json(somthing that it easy ).Thanks — tree em
– tree em, Commented Dec 25, 2009 at 9:55
"simplejson module to write in JSON format" it good .thank you very much. — tree em
– tree em, Commented Dec 25, 2009 at 10:13

Denis Otkidach · Accepted Answer · 2009-12-25 10:13:20Z

3

Some tips:

you can convert django's QueryDict to to Python dictionary with dict(keyword_filter) expression,
you can add additional record to the dictionary with dict(keyword_filter, name=filter_name) expression.

Then use json module to dump JSON and write it to the file.

answered Dec 25, 2009 at 10:13

Denis Otkidach

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mac · Accepted Answer · 2012-10-02 15:01:13Z

2

Your question is difficult to understand. I am not sure what you need. Here is my best attempt to solve your problem.

def save_fiter_to_JSON(self, dest, filter_name, keyword_filter):
    # start with an empty list
    lst = []

    # I don't know where you will get your qd (QueryDict instance)
    # filter something using keyword_filter?  Replace this with actual code
    for qd in ??FILTER_SOMETHING??(keyword_filter):
        # make a mutable copy of the QueryDict
        d = qd.copy()
        # update the copy by adding "name"
        d["name"] = filter_name
        # append dict instance to end of list
        lst.append(d)

    # get a string with JSON encoding the list
    s = json.dumps(lst)

    f = open(dest, 'a')
    f.write(s + "\n")
    f.close()

edited Oct 2, 2012 at 15:01

mac

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answered Dec 25, 2009 at 9:59

steveha

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1 Comment

tree em Over a year ago

in my method keyword_filter=<QueryDict: {u'customer_type': [u'FRI'], u'tag': [u'2,3']}> that will be passed.

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