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Python JSONDecoder custom translation of null type


Python JSONDecoder custom translation of null type

By : Kewal Singh Paneser
Date : November 17 2020, 11:52 AM
should help you out UPDATE 12/30/2014
The easiest way to achieve this would be to use the object_hook callback of the JSONDecoder as described in my old answer below. But, since this would require an extra function call for each key-value pair in the data, this might have an impact on performance.
code :
import json

def make_my_scanner(context):
    # reference to actual scanner
    interal_scanner = json.scanner.py_make_scanner(context)

    # some references for the _scan_once function below
    parse_object = context.parse_object
    parse_array = context.parse_array
    parse_string = context.parse_string
    encoding = context.encoding
    strict = context.strict
    object_hook = context.object_hook
    object_pairs_hook = context.object_pairs_hook

    # customized _scan_once
    def _scan_once(string, idx):
        try:
            nextchar = string[idx]
        except IndexError:
            raise StopIteration

        # override some parse_** calls with the correct _scan_once
        if nextchar == '"':
            return parse_string(string, idx + 1, encoding, strict)
        elif nextchar == '{':
            return parse_object((string, idx + 1), encoding, strict,
                _scan_once, object_hook, object_pairs_hook)
        elif nextchar == '[':
            return parse_array((string, idx + 1), _scan_once)
        elif nextchar == 'n' and string[idx:idx + 4] == 'null':
            return 'Cat', idx + 4

        # invoke default scanner
        return interal_scanner(string, idx)

    return _scan_once
class MyJSONDecoder(json.JSONDecoder):
    def __init__(self, encoding=None, object_hook=None, parse_float=None,
            parse_int=None, parse_constant=None, strict=True,
            object_pairs_hook=None):

        json.JSONDecoder.__init__(self, encoding, object_hook, parse_float, parse_int, parse_constant, strict, object_pairs_hook)

        # override scanner
        self.scan_once = make_my_scanner(self)
decoder = MyJSONDecoder()
print decoder.decode('{"field1":null, "field2": "data!"}')
import json

def parse_object(o):
    for key in o:
        if o[key] is None:
            o[key] = 'Cat'
    return o

decoder = json.JSONDecoder(object_hook=parse_object)

print decoder.decode('{"field1":null, "field2": "data!"}')
# that will print: {u'field2': u'data!', u'field1': u'Cat'}


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Change the custom post type names (for translation)

Change the custom post type names (for translation)


By : John Nguyen Student
Date : March 29 2020, 07:55 AM
I hope this helps you . At some part of your code the function register_post_type() will get called, one each for testimonial and services.
You need to change the parameters of this function, specifically the 'rewrite' parameter. If you wrote these functions in your own code, changing is easy. If not hopefully the theme or plugin has filters you can change the parameters from.
code :
register_post_type( /*other parameters*/, 'rewrite' => array( 'slug' => 'turkish for testimonial') );
JSONDecoder can't handle null response

JSONDecoder can't handle null response


By : Chris Genly
Date : March 29 2020, 07:55 AM
To fix this issue Unfortunately JSONDecoder does not expose the underlying JSONSerialization option (.allowFragments) that would support JSON fragments like a solo null value. You could try transforming the response or just using JSONSerialization directly. Unfortunately there's nothing elegant to be done here.
Instance member 'decode' cannot be used on type 'JSONDecoder'; did you mean to use a value of this type instead

Instance member 'decode' cannot be used on type 'JSONDecoder'; did you mean to use a value of this type instead


By : user1953514
Date : March 29 2020, 07:55 AM
This might help you I implementing JSONDecoder on to get the JSON data from Wordpress json my struct is in the other swift file i get this error here's my code. on let article I get the error , The article should be declared as:
code :
let decoder = JSONDecoder()
let article = decoder.decode(LatestArticleModel.self , from: data)
Custom JSON data decode using Swift 4 JSONDecoder.DataDecodingStrategy.custom(_:)

Custom JSON data decode using Swift 4 JSONDecoder.DataDecodingStrategy.custom(_:)


By : user2446127
Date : March 29 2020, 07:55 AM
may help you . Here's a more comprehensive example of custom data encoding and decoding strategy. Let's start with a very simple data model:
code :
struct Model: Codable {
    var data: Data
}
let m = Model(data: "Hello world".data(using: .utf8)!)
let json = try JSONEncoder().encode(m)
let jsonString = String(data: json, encoding: .utf8)!

print(jsonString) // {"data":"SGVsbG8gd29ybGQ="}
func customDataEncoder(data: Data, encoder: Encoder) throws {
    let str = (0..<data.count).map {
        String(data[$0], radix: 16, uppercase: true)
    }.joined(separator: " ")

    var container = encoder.singleValueContainer()
    try container.encode(str)
}

let encoder = JSONEncoder()
encoder.dataEncodingStrategy = .custom(customDataEncoder)

let m = Model(data: "Hello world".data(using: .utf8)!)
let json = try JSONEncoder().encode(m)
let jsonString = String(data: json, encoding: .utf8)!

print(jsonString) // {"data":"48 65 6C 6C 6F 20 77 6F 72 6C 64"}
func customDataDecoder(decoder: Decoder) throws -> Data {
    let container = try decoder.singleValueContainer()
    let str = try container.decode(String.self)

    let bytes = str.components(separatedBy: " ").map {
        UInt8($0, radix: 16)!
    }
    return Data(bytes)
}

let decoder = JSONDecoder()
decoder.dataDecodingStrategy = .custom(customDataDecoder)

let decodedM = try decoder.decode(Model.self, from: json)
print(m.data == decodedM.data) // true
{
    "data": {
        "count": 11,
        "string": "Hello world",
        "hex": "48 65 6C 6C 6F 20 77 6F 72 6C 64"
    }
}
Why do I get ‘Cannot get keyed decoding container -- found null value instead.’ error when I use JSONDecoder

Why do I get ‘Cannot get keyed decoding container -- found null value instead.’ error when I use JSONDecoder


By : user3526433
Date : March 29 2020, 07:55 AM
With these it helps You need to mark the types as Optional (?) wherever you're expecting null in the JSON.
But, the issue with the above parsing is different from the one you described in the question.
code :
do {
    let response = try JSONDecoder().decode(BuildingRequestDetails.self, from: data)
    print(response)
} catch {
    print(error)
}
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