Append element into a json object python

Question

I have a Json object and Im trying to add a new element every time I enter a new number. The Json looks like this:

[
    {
        "range": [1,2,3,4,5]
    }
]

This is my code:

import json

number = raw_input("enter a number: ")

json_file = 'json.json'
json_data = open(json_file)
data = json.load(json_data)
data.append({"range": number})
print data

If my new number is 10 for example, I want my new json document to have: [1, 2, 3, 4, 5, 10]. The output I'm getting with my code is:

[{u'range': [1, 2, 3, 4, 5]}, {'range': '25'}]

I'm using python 2.6

ForceBru · Accepted Answer · 2015-09-16 14:39:19Z

1

You need something like this

data[0]['range'].append(10)

Or use int(your_number) instead of 10

edited Sep 16, 2015 at 14:39

answered Sep 16, 2015 at 14:33

ForceBru

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1 Comment

Gusbok Over a year ago

Its appending! but Im getting it like a char: [{u'range': [1, 2, 3, 4, 5, '10']}]. How can I change it to a number?

Łukasz Rogalski · Accepted Answer · 2015-09-16 14:57:16Z

1

Your json object consists of:

single element list
first element of list is mapping with single key (range)
this key value is a list

To append to this list you have to:

take first element from list - data[0]
take a correct value from mapping - data[0]['range']
append to retrieved list - data[0]['range'].append(new_value)

edited Sep 16, 2015 at 14:57

answered Sep 16, 2015 at 14:41

Łukasz Rogalski

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Comments

Kasravnd · Accepted Answer · 2015-09-16 14:35:32Z

0

First of all for opening a file you can use with statement which will close the file the the end of the block, the you can load your json file and after that you can will have a list contains a dictionary which you can access to dictionary with index 0 and access to the list value with data[0]['range'] and finally you can append your number list :

import json

number = raw_input("enter a number: ")

json_file = 'json.json'
with open(json_file) as json_data:
    data = json.load(json_data)
    data[0]['range'].append(int(number))
print data

answered Sep 16, 2015 at 14:35

Kasravnd

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1 Comment

Gusbok Over a year ago

Thank you! Thats what I need! I will accept your answer as soon as I can.

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