Encoding dan Decoding JSON

Pendahuluan

json.dumps()

import json
d = {'name': 'Alice', 'age': 30, 'active': True}
print(json.dumps(d, indent=2))

json.loads()

import json
s = '{"name": "Alice", "scores": [90, 85]}'
data = json.loads(s)
print(type(data), data['name'])

json.dump() ke Berkas

import json, tempfile, os
tmp = tempfile.mktemp(suffix='.json')
with open(tmp, 'w') as f:
    json.dump({'x': 1}, f, indent=2)
print(open(tmp).read())
os.unlink(tmp)

json.load() dari Berkas

import json, io
buf = io.StringIO('{"key": "value"}')
data = json.load(buf)
print(data)

Pemetaan Jenis JSON

import json
s = '[1, "two", true, null, {"a": 3.14}]'
print(json.loads(s))

Jenis yang Tidak Dapat Diserialisasi

import json
from datetime import datetime
def default(obj):
    if isinstance(obj, datetime):
        return obj.isoformat()
    raise TypeError(f'{type(obj)} not serializable')
print(json.dumps({'ts': datetime.now()}, default=default))

sort_keys dan separators

import json
d = {'z': 3, 'a': 1, 'm': 2}
print(json.dumps(d, sort_keys=True, separators=(',', ':')))

Pencetakan dengan Format Rapi

import json
d = {'name': 'Mehmet', 'city': 'Istanbul'}
print(json.dumps(d, indent=4, ensure_ascii=False))

JSONDecodeError

import json
try:
    json.loads('{bad json}')
except json.JSONDecodeError as e:
    print(f'Parse error: {e}')

Memperbarui Berkas JSON

import json, io
buf = io.StringIO('{"count": 5}')
data = json.load(buf)
data['count'] += 1
print(json.dumps(data))

Pemeriksaan Singkat

Ringkasan

Lanjutkan