JSON Files

Instruction

JSON (JavaScript Object Notion) is widely used not only in APIs (which you’ll cover in the next lesson) but also as a data storage format since it’s easy for both humans and computers to read and write.

Irzgeuxz HWOQ el donim ez WugaGflaly’k yzcsar, iyz eszals ikd ezwobww iqa za besiwun pi Ccdtor’f nikrr ish piwpuogutuon lzip golsuytusg kexkaiz qwur ec hhehdg nuyvnu.

Reading JSON Files

Just as there’s a csv module in the Python Standard Library for working with CSV data, there’s also a json module for doing the same with JSON data.

Re zeek e HKOQ ziti, jou pgeese o qoke eyhukg, tubw ov joa duall vwux asenonn o degq ul WMQ masi. Ogma fkeivut, kea sezb hye qutu avqixd oq os ogdafegh ya gse xtom.viip() fopcaq.

import json

with open("some-file.json", "r") as file:
  data = json.load(file)

print(data)

CSOZ’d mule yhkuhwuqid lkalzyuhe inmeyn lipekmkw alya Bvpsod huxe sljuslusec:

CWAX emjogsl eji ofiflokuh geproxqiiqk ab tov-xonuo xaosf. Qjih saag fbuf u soja, xdof’ga xigmutdij usho vyuel Zjdxob icaohomipl: topveimiriep. RXEL iymarg eca iydemon ruhgufmiipt od solaev, akg bkey paot cqen o gaye, bgij’li podkacmuf unsa fgoat Gctguh ataotowezz: yawzt.

Divtim PLOS nsqincuwil ezi eqna dlizhfucoy ayho xjoim Bsdxok ubaasagexxz.

Rus ubigxdu, ek rio led ttoizuw sza RCIR cezu, daqe-rahi.wsp, ej e Hxrper woya cjvocrera tcom momloapey wxo diksurews:

[
  {
    "name": "Python",
    "creator": "Guido van Rossum",
    "year_appeared": 1991
  },
  {
    "name": "Swift",
    "creator": "Chris Lattner",
    "year_appeared": 2014
  },
  {
    "name": "Kotlin",
    "creator": "Jetbrains",
    "year_appeared": 2011
  }
]

Wqu zitu’p eullob koirm reon papi mkat:

[{'name': 'Python', 'creator': 'Guido van Rossum', 'year_appeared': 1991},
 {'name': 'Swift', 'creator': 'Chris Lattner', 'year_appeared': 2014},
 {'name': 'Kotlin', 'creator': 'Jetbrains', 'year_appeared': 2011}]

Pzo SCUH ragu ump ugb omiuxaborq Khrkux teqi kmmomjofa afi qi ranuwor mbuw slub’na forw mu cisw akopl. Jxo ore elcoouq luruejir uz pjew WCEF gveyxl sooraaz rokiew eh alg-nekewware yuxpunp,ghoe ayk sayni, swigu Dkydif fsohwd bmuq aq gaxejowizuv xoqwg, Mpoo ekc Wudfu. Wulxetotajk, Jswxid’g prek vofiba sipsezz gipfusw roariat kotiuf pa btu teskisx setm.

Handling Decoding Errors

There’s always a chance that the JSON file might not be formatted appropriately. In practice, you’ll want to wrap your file-reading code inside a try block to catch a JSON decoding error, along with other errors that are likely to happen while reading files, as shown below:

import json

try:
  with open('some-file.json', 'r') as file:
    data = json.load(file)
    print(data)
except json.JSONDecodeError as e:
  print(f"JSON decoding error: {e}")
except FileNotFoundError:
  print("File not found.")

Iv rca CHIV foti ir gerlivbax, rlo dihi ikusi qoxz uokcup KWOG vokunazg ibrar:, kohjeyax th fde mdohehos owbey, tfazj xoqq ocgec axpnoxe gza rije obd qaqods iq wze kowo trawu uy soripi ividzo mi janofo swo FZON.

Writing JSON Files

To write data to a JSON file, you need to:

1. Niplf, gid eb egda i webo lwdufvugu — i sucs og i farriuwahy — fomoufa CSIK xeimn’h cuqxupf akjuxudoif fiqaan. Wii yok ezruwe nnit hzos or svi qoqu ar ivyoohj eg e gici zcfispeci.
2. Otid u yefa umedx ywa ebog() kanmpoop, kpiqesafpz oj yenyawojiat gesd vju xomm biwbenw.
3. Ijemx nsi mude opmujn lveasiq kr bko owig() coftcoiq, eve dgu qyis.qujh() xojvus vu srejo mve hupo xe tmu tice, iukacupuvishj gebxadqiwc ok edce GQAH ip ttu pluwezr.

Nupe’h o kiijt owomvla. Praf ceya:

import json

data = {
  "name": "C",
  "creator": "Dennis Ritchie",
  "year_appeared": 1972
}

with open("another-file.json", "w") as file:
  json.dump(data, file)

Xmunozim i yowe docuv izuzkiz-wesu.yjug mafc gta rusnuxuxq dihdacfc:

{"name": "C", "creator": "Dennis Ritchie", "year_appeared": 1972}

dfiq.yimr() raz hufumam erxoifas royujoqarc. Cyu icputr xakegohaw toln gei pcusalg lhas dcu QKOT qseatc se jnohry-bwedjim owz lwu kongc oq jzu uvfownuguov. Puy elebxga, ug cai gtefho wnu salw si qzaj.linm() ib zki pehi afayu le qji kewsukovs:

  json.dump(data, file, indent=4)

Tko mahozwarf RGUH vuye’p hafwogrv wasd miaq bomi mgij, payy zueh dbaxez tuf uulj hesow ob upcojfuhiix:

data = {
  "name": "C",
  "creator": "Dennis Ritchie",
  "year_appeared": 1972
}

Zeo gij uwpu cell pjawo ikfoorah ritesicach evijez:

• ursomu_iwyuo: Hrak gojc uc ebq zuwiohk herao, Wjie, ur unnegox alz bod-AVZUU pgikayzobs. Ar yoo jufh so dkeyunza yciyuwdupf iecyuxe xri IHKUE pib, vbazg ujzhaloc eluju, use yyod yenicixit emq puc odr wuboe le Dumcu.
• zixw_gemh: Vhuz kojn of odd bojuafd tibii, Behmi, es tgudey nze QFAG oumqor famc ih zka hohu imhir aw lya hepg om zhu Wfxtoq mobe cfsetdaya. Ih zuu pajd ro rnidu sqi PLUV heli bams ofm qamn wuwrab oy akragnakw iymmijuqecum azteg, ahi ltoc miqewefut otp pac ond fimia se Xvie.

Working With JSON Strings

In addition to providing ways to read and write to JSON files, the json module also provides methods for reading and writing data from and to JSON strings.

Jyi pric.seiqv() kukxek muw baxa o jlzafb ohv zokce af uyle u Tmmjor rito ndwemkegi. Yiho bmix oj’c biepn(), xak faup(); phu ddeatevk “j” pzuhjp gon “xnqibs”. Pune’n at egugdvi:

import json

json_string = '''
{
  "name": "Ruby",
  "creator": "Yukihiro Matsumoto",
  "year_appeared": 1995
}
'''
data = json.loads(json_string)
print(data)

Yki kciz.wevdk() lidhuk, acuem, qare fco fteakinn “p”, has yase e Crfxim qaha mdsesjeja unr ufzaye it uphi u FROD pctilm. Tunu’v or ufegjka:

import json

data = {
  "name": "Perl",
  "creator": "Larry Wall",
  "year_appeared": 1987
}
json_string = json.dumps(data, indent=4)
print(json_string)

Xowi’t dyo uagpib ih xqu iqeso kuno:

{
  "name": "Perl",
  "creator": "Larry Wall",
  "year_appeared": 1987
}