Develop Reference

How do I output specific data from a json response?

I am fairly new to using APIs in python and I am trying to create a system that outputs data from previous motorsport races. I have sent requests to an API, but I am struggling to get it to just output one specific piece of data (eg. time, location). I get this when I just print the raw JSON data sent.
{
"MRData": {
"RaceTable": {
"Races": [
{
"Circuit": {
"Location": {
"country": "Spain",
"lat": "41.57",
"locality": "Montmeló",
"long": "2.26111"
},
"circuitId": "catalunya",
"circuitName": "Circuit de Barcelona-Catalunya",
"url": "http://en.wikipedia.org/wiki/Circuit_de_Barcelona-Catalunya"
},
"date": "2020-08-16",
"raceName": "Spanish Grand Prix",
"round": "6",
"season": "2020",
"time": "13:10:00Z",
"url": "https://en.wikipedia.org/wiki/2020_Spanish_Grand_Prix"
}
],
"round": "6",
"season": "2020"
},
"limit": "30",
"offset": "0",
"series": "f1",
"total": "1",
"url": "http://ergast.com/api/f1/2020/6.json",
"xmlns": "http://ergast.com/mrd/1.4"
}
}
Just to get to grips with APIs I am simply trying to output a simple piece of data of a specific race, and once I can do that, I'll be able to scale it up and output all sorts of data. I'd assumed it would just be as simple as typing print(data['time']) (as seen below) but I get an error message saying this:
KeyError: 'time'
My source code:
import requests
response = requests.get("http://ergast.com/api/f1/2020/6.json")
data = response.json()
print (data["time"])
Any help is appreciated!

Like this...
import json
data = """{
"MRData":{
"xmlns":"http://ergast.com/mrd/1.4",
"series":"f1",
"url":"http://ergast.com/api/f1/2020/6.json",
"limit":"30",
"offset":"0",
"total":"1",
"RaceTable":{
"season":"2020",
"round":"6",
"Races":[
{
"season":"2020",
"round":"6",
"url":"https://en.wikipedia.org/wiki/2020_Spanish_Grand_Prix",
"raceName":"Spanish Grand Prix",
"Circuit":{
"circuitId":"catalunya",
"url":"http://en.wikipedia.org/wiki/Circuit_de_Barcelona-Catalunya",
"circuitName":"Circuit de Barcelona-Catalunya",
"Location":{
"lat":"41.57",
"long":"2.26111",
"locality":"Montmeló",
"country":"Spain"
}
},
"date":"2020-08-16",
"time":"13:10:00Z"
}
]
}
}
}"""
jsonData = json.loads(data)
Races is an array, in this case there is only one race so you would desigate it as ["Races"][0]
print(jsonData["MRData"]["RaceTable"]["Races"][0]["time"])

data['time'] would work if you had a flat dictionary, but you have a nested dicts/list structure, so:
data["MRData"]["RaceTable"]["Races"][0]["time"]
data["MRData"] returns another dict, which has a key "RaceTable". The value of this key is again a dictionary which has a key "Races". The value of this is a list of races, of which you only have one. The races are again dicts which have the key time.

How do you parsing nested JSON data for specific information?

I'm using the national weather service API and when you use a specific URL you get JSON data back. My program so far grabs everything including 155 hours of weather data.
Simply put I'm trying to parse the data and grab the weather for the
latest hour but everything is in a nested data structure.
My code, JSON data, and more information are below. Any help is appreciated.
import requests
import json
def get_current_weather(): #This method returns json data from the api
url = 'https://api.weather.gov/gridpoints/*office*/*any number,*any number*/forecast/hourly'
response = requests.get(url)
full_data = response.json()
return full_data
def main(): #Prints the information grabbed from the API
print(get_current_weather())
if __name__ == "__main__":
main()
In the JSON response, I get there are 3 layers before you get to the 'shortForecast' data that I'm trying to get. The first nest is 'properties, everything before it is irrelevant to my program. The second nest is 'periods' and each period is a new hour, 0 being the latest. Lastly, I just need to grab the 'shortForcast' in the first period or periods[0].
{
"#context": [
"https://geojson.org/geojson-ld/geojson-context.jsonld",
{
"#version": "1.1",
"wx": "https://api.weather.gov/ontology#",
"geo": "http://www.opengis.net/ont/geosparql#",
"unit": "http://codes.wmo.int/common/unit/",
"#vocab": "https://api.weather.gov/ontology#"
}
],
"type": "Feature",
"geometry": {
"type": "Polygon",
"coordinates": [
[
*data I'm not gonna add*
]
]
},
"properties": {
"updated": "2021-02-11T05:57:24+00:00",
"units": "us",
"forecastGenerator": "HourlyForecastGenerator",
"generatedAt": "2021-02-11T07:12:58+00:00",
"updateTime": "2021-02-11T05:57:24+00:00",
"validTimes": "2021-02-10T23:00:00+00:00/P7DT14H",
"elevation": {
"value": ,
"unitCode": "unit:m"
},
"periods": [
{
"number": 1,
"name": "",
"startTime": "2021-02-11T02:00:00-05:00",
"endTime": "2021-02-11T03:00:00-05:00",
"isDaytime": false,
"temperature": 18,
"temperatureUnit": "F",
"temperatureTrend": null,
"windSpeed": "10 mph",
"windDirection": "N",
"icon": "https://api.weather.gov/icons/land/night/snow,40?size=small",
"shortForecast": "Chance Light Snow",
"detailedForecast": ""
},
{
"number": 2,
"name": "",
"startTime": "2021-02-11T03:00:00-05:00",
"endTime": "2021-02-11T04:00:00-05:00",
"isDaytime": false,
"temperature": 17,
"temperatureUnit": "F",
"temperatureTrend": null,
"windSpeed": "12 mph",
"windDirection": "N",
"icon": "https://api.weather.gov/icons/land/night/snow,40?size=small",
"shortForecast": "Chance Light Snow",
"detailedForecast": ""
},
OK, so I didn't want to edit everything again so this is the new get_current_weather method. I was able to get to 'periods but after that I'm still stumped. This is the new method.
def get_current_weather():
url = 'https://api.weather.gov/gridpoints/ILN/82,83/forecast/hourly'
response = requests.get(url)
full_data = response.json()
return full_data['properties'].get('periods')

For the dictionary object, you can access the nested elements by using indexing multiple times.
So, for your dictionary object, you can use the following to get the value for the key shortForecast for the first element in the list of dictionaries under key periods under the key properties in the main dictionary:
full_data['properties']['periods'][0]['shortForecast']

Need read some data from JSON

I need to make a get (id, name, fraction id) for each deputy in this json
{
"id": "75785",
"title": "(за основу)",
"asozdUrl": null,
"datetime": "2011-12-21T12:20:26+0400",
"votes": [
{
"deputy": {
"id": "99111772",
"name": "Абалаков Александр Николаевич",
"faction": {
"id": "72100004",
"title": "КПРФ"
}
},
"result": "accept"
},
{
"deputy": {
"id": "99100491",
"name": "Абдулатипов Рамазан Гаджимурадович",
"faction": {
"id": "72100024",
"title": "ЕР"
}
},
"result": "none"
}
.......,` etc
My code is looks like that:
urlData = "https://raw.githubusercontent.com/data-dumaGovRu/vote/master/poll/2011-12-21/75785.json"
response = urllib.request.urlopen(urlData)
content = response.read()
data = json.loads(content.decode("utf8"))
for i in data:
#print(data["name"])
`
And i dont know what to do with that #print line, how I should write it?

You can access the list containing the deputies with data['votes']. Iterating through the list, you can access the keys you're interested in as you would with dict key lookups. Nested dicts imply you have to walk through the keys starting from the root to your point of interest:
for d in data['votes']:
print(d['deputy']['id'], d['deputy']['name'], d['deputy']['faction']['id'])

Issues decoding Collections+JSON in Python

I've been trying to decode a JSON response in Collections+JSON format using Python for a while now but I can't seem to overcome a small issue.
First of all, here is the JSON response:
{
"collection": {
"href": "http://localhost:8000/social/messages-api/",
"items": [
{
"data": [
{
"name": "messageID",
"value": 19
},
{
"name": "author",
"value": "mike"
},
{
"name": "recipient",
"value": "dan"
},
{
"name": "pm",
"value": "0"
},
{
"name": "time",
"value": "2015-03-31T15:04:01.165060Z"
},
{
"name": "text",
"value": "first message"
}
]
}
],
"version": "1.0",
"links": []
}
}
And here is how I am attempting to extract data:
response = urllib2.urlopen('myurl')
responseData = response.read()
jsonData = json.loads(responseData)
test = jsonData['collection']['items']['data']
When I run this code I get the error:
list indices must be integers, not str
If I use an integer, e.g. 0, instead of a string it merely shows 'data' instead of any useful information, unlike if I were to simply output 'items'. Similarly, I can't seem to access the data within a data child, for example:
test = jsonData['collection']['items'][0]['name']
This will argue that there is no element called 'name'.
What is the proper method of accessing JSON data in this situation? I would also like to iterate over the collection, if that helps.
I'm aware of a package that can be used to simplify working with Collections+JSON in Python, collection-json, but I'd rather be able to do this without using such a package.

Getting Deeper Level JSON Values in Python

I have a Python script that make an API call to retrieve data from Zendesk. (Using Python 3.x) The JSON object has a structure like this:
{
"id": 35436,
"url": "https://company.zendesk.com/api/v2/tickets/35436.json",
"external_id": "ahg35h3jh",
"created_at": "2009-07-20T22:55:29Z",
"updated_at": "2011-05-05T10:38:52Z",
"type": "incident",
"subject": "Help, my printer is on fire!",
"raw_subject": "{{dc.printer_on_fire}}",
"description": "The fire is very colorful.",
"priority": "high",
"status": "open",
"recipient": "support#company.com",
"requester_id": 20978392,
"submitter_id": 76872,
"assignee_id": 235323,
"organization_id": 509974,
"group_id": 98738,
"collaborator_ids": [35334, 234],
"forum_topic_id": 72648221,
"problem_id": 9873764,
"has_incidents": false,
"due_at": null,
"tags": ["enterprise", "other_tag"],
"via": {
"channel": "web"
},
"custom_fields": [
{
"id": 27642,
"value": "745"
},
{
"id": 27648,
"value": "yes"
}
],
"satisfaction_rating": {
"id": 1234,
"score": "good",
"comment": "Great support!"
},
"sharing_agreement_ids": [84432]
}
Where I am running into issues is in the "custom_fields" section specifically. I have a particular custom field inside of each ticket I need the value for, and I only want that particular value.
To spare you too many specifics of the Python code, I am reading through each value below for each ticket and adding it to an output variable before writing that output variable to a .csv. Here is the particular place the breakage is occuring:
output += str(ticket['custom_fields'][id:23825198]).replace(',', '')+','
All the replace nonsense is to make sure that since it is going into a comma delimited file, any commas inside of the values are removed. Anyway, here is the error I am getting:
output += str(ticket['custom_fields'][id:int(23825198)]).replace(',', '')+','
TypeError: slice indices must be integers or None or have an __index__ method
As you can see I have tried a couple different variations of this to try and resolve the issue, and have yet to find a fix. I could use some help!
Thanks...

Are you using json.loads()? If so you can then get the keys, and do an if statement against the keys. An example on how to get the keys and their respective values is shown below.
import json
some_json = """{
"id": 35436,
"url": "https://company.zendesk.com/api/v2/tickets/35436.json",
"external_id": "ahg35h3jh",
"created_at": "2009-07-20T22:55:29Z",
"updated_at": "2011-05-05T10:38:52Z",
"type": "incident",
"subject": "Help, my printer is on fire!",
"raw_subject": "{{dc.printer_on_fire}}",
"description": "The fire is very colorful.",
"priority": "high",
"status": "open",
"recipient": "support#company.com",
"requester_id": 20978392,
"submitter_id": 76872,
"assignee_id": 235323,
"organization_id": 509974,
"group_id": 98738,
"collaborator_ids": [35334, 234],
"forum_topic_id": 72648221,
"problem_id": 9873764,
"has_incidents": false,
"due_at": null,
"tags": ["enterprise", "other_tag"],
"via": {
"channel": "web"
},
"custom_fields": [
{
"sid": 27642,
"value": "745"
},
{
"id": 27648,
"value": "yes"
}
],
"satisfaction_rating": {
"id": 1234,
"score": "good",
"comment": "Great support!"
},
"sharing_agreement_ids": [84432]
}"""
# load the json object
zenJSONObj = json.loads(some_json)
# Shows a list of all custom fields
print("All the custom field data")
print(zenJSONObj['custom_fields'])
print("----")
# Tells you all the keys in the custom_fields
print("How keys and the values")
for custom_field in zenJSONObj['custom_fields']:
print("----")
for key in custom_field.keys():
print("key:",key," value: ",custom_field[key])
You can then modify the JSON object by doing something like
print(zenJSONObj['custom_fields'][0])
zenJSONObj['custom_fields'][0]['value'] = 'something new'
print(zenJSONObj['custom_fields'][0])
Then re-encode it using the following:
newJSONObject = json.dumps(zenJSONObj, sort_keys=True, indent=4)
I hope this is of some help.