create .json file python example pdf

stackoverflow.com › questions › 57314427 › generate-a-json-file-with-python

Just use normal dictionaries in python when constructing the JSON then use the JSON package to export to JSON files.

You can construct them like this (long way):

a_dict = {}
a_dict['id'] = {}
a_dict['id']['a'] = {'properties' : {}}
a_dict['id']['a']['properties']['x'] = '9'
a_dict['id']['a']['properties']['y'] = '3'
a_dict['id']['a']['properties']['z'] = '17'
a_dict['id']['b'] = {'properties' : {}}
a_dict['id']['b']['properties']['x'] = '3'
a_dict['id']['b']['properties']['y'] = '2'
a_dict['id']['b']['properties']['z'] = '1'

or you can use a function:

def dict_construct(id, x, y, z):
 new_dic = {id : {'properties': {} } }
 values = [{'x': x}, {'y': y}, {'z':z}]
 for val in values:
    new_dic[id]['properties'].update(val)
 return new_dic

return_values = [('a', '9', '3', '17'), ('b', '3', '2', '1')]

a_dict = {'id': {} }
for xx in return_values:
    add_dict = dict_construct(*xx)
    a_dict['id'].update(add_dict)

print(a_dict)

both give you as a dictionary:

{'id': {'a': {'properties': {'x': '9', 'y': '3', 'z': '17'}}, 'b': {'properties': {'x': '3', 'y': '2', 'z': '1'}}}}

using json.dump:

with open('data.json', 'w') as outfile:
    json.dump(a_dict, outfile)

you get as a file:

{
  "id": {
    "a": {
      "properties": {
        "x": "9",
        "y": "3",
        "z": "17"
      }
    },
    "b": {
      "properties": {
        "x": "3",
        "y": "2",
        "z": "1"
      }
    }
  }
}

Answer from Anna Nevison on Stack Overflow

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stackoverflow.com › questions › 57314427 › generate-a-json-file-with-python

Generate a JSON file with Python - Stack Overflow

Top answer

1 of 3

Just use normal dictionaries in python when constructing the JSON then use the JSON package to export to JSON files.

You can construct them like this (long way):

a_dict = {}
a_dict['id'] = {}
a_dict['id']['a'] = {'properties' : {}}
a_dict['id']['a']['properties']['x'] = '9'
a_dict['id']['a']['properties']['y'] = '3'
a_dict['id']['a']['properties']['z'] = '17'
a_dict['id']['b'] = {'properties' : {}}
a_dict['id']['b']['properties']['x'] = '3'
a_dict['id']['b']['properties']['y'] = '2'
a_dict['id']['b']['properties']['z'] = '1'

or you can use a function:

def dict_construct(id, x, y, z):
 new_dic = {id : {'properties': {} } }
 values = [{'x': x}, {'y': y}, {'z':z}]
 for val in values:
    new_dic[id]['properties'].update(val)
 return new_dic

return_values = [('a', '9', '3', '17'), ('b', '3', '2', '1')]

a_dict = {'id': {} }
for xx in return_values:
    add_dict = dict_construct(*xx)
    a_dict['id'].update(add_dict)

print(a_dict)

both give you as a dictionary:

{'id': {'a': {'properties': {'x': '9', 'y': '3', 'z': '17'}}, 'b': {'properties': {'x': '3', 'y': '2', 'z': '1'}}}}

using json.dump:

with open('data.json', 'w') as outfile:
    json.dump(a_dict, outfile)

you get as a file:

{
  "id": {
    "a": {
      "properties": {
        "x": "9",
        "y": "3",
        "z": "17"
      }
    },
    "b": {
      "properties": {
        "x": "3",
        "y": "2",
        "z": "1"
      }
    }
  }
}

2 of 3

One way will be to create whole dict at once:

data = {} 
for i in range(1, 5):
    name = getname(i)
    x = getx(i)
    y = gety(i)
    z = getz(i)
    data[name] = {
        "x": x,
        "y": y,
        "z": z
      }

And then save

 with open('data.json', 'w') as f:
    json.dump(data, f, indent=4)

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More results from stackoverflow.com

reddit.com › r/learnpython › how would you use python to create json files?

r/learnpython on Reddit: How would you use python to create JSON files?

March 7, 2020 -

Howdy!

I recently took a coding test for an internship program, I was quickly put in check by the coding test. I am only about 50 hours into coding, but I had higher hopes for myself then how I performed.

The questions that tripped me up were how to take input in the form of a Dict [] and create a JSON object out of it. I was allowed to read documentation during the test and found the JSON library with json.dumps, but couldn't figure out how to use it in the allotted time. =^(

In the spirit of improvement would you fine folks of r/learnpython be willing to show how you would create a JSON object with python, and outline some reasons as to why you would want to create a JSON object in the first place? I'm hoping to learn something new, but I also hope that there are a few on this sub who can come across the post and learn something new too.

On the bright side, I solved FizzBuzz no problem. That problem gave me anxiety when I first started coding, and now I can solve it expertly. Little wins!

Thank you! =^)

Top answer

1 of 4

I read two concrete questions from your post: why you would want to create a JSON object Imagine you want multiple software systems to communicate. Let's say we have three systems, one written in Python, one client written in JavaScript and one more backend system in Java. You can't just send Python objects over a network and expect the systems written in JS or Java to understand them. Same thing the other way around. In the end it's just electrical signals and both the sender and receiver need a common understanding of how to interpret those signals, otherwise they will just be gibberish. That's where data formats like JSON come into play: It's a simple and standardized data format that can be handled in any modern programming language. Now your Python code can serialize its internal representation of a piece of data into this format and send it over a network or store it on some disk, where some other system will eventually pick it up, deserialize it into its own internal representation and process it. show how you would create a JSON object with python import json data = {"year": 2020, "sales": 12345678, "currency": "€"} # creating a JSON string json_string = json.dumps(data) # storing it in a file with open("data.json", "w") as json_file: json.dump(data, json_file)

2 of 4

If you know about the JSON library, there's not much more to tell. RealPython have excellent tutorials and information. https://realpython.com/python-json/ You can find a lot more by searching "python json tutorial".

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