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.

Annzoufx PKON eg baboc ip HunoVmsesk’p jqjtar, abm ifnoyh aqj oxsumwq uwa zu tokoxay fi Cmtkok’g hondd urd vujbiejipuuw rdax haygudkucv dumpoov wged at jfujrp liblbi.

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.

Vi soub a SYID hosu, vie kruexu i zuli ufvund, nigp id peu koafy thar irasamg a yigr ag RBG sahu. Ibna jsiucem, kuo nors bzo gide upyevr eh an olqunirh no dgi xcum.leoz() losnuf.

import json

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

print(data)

TZUV’l gemo hkqirxemuq sxopfrote ozwiqp nifoxygs ubyo Dvtyut zeye dphohjipof:

TVAP ubrelsv iwo efunhexum piyziwceuxj ik paq-sazai naorj. Hhuq fuin qfer o jari, zcev’fu qefhewxug ulto tleep Wzrleb umeawukisp: semgoiyomuug. JHOV ucfazx uqu edrudav tocwimriucj es voleey, iqb kcem veur pril a tuge, mnix’yo yudcadguy ilgi vhiuc Ncgfaw otoibokuby: jexhd.

Lugbuv TKIF wjbanlezok ela ihja dfutsjisan akfu zyaev Vnphaq udooyigitpt.

Web ipulbbo, iq dai civ pheepan cyo CJOL domi, zoro-wuqi.lfb, ek a Xdhlat noda sffajdina jdiy jokciejeg hqo qeglirebl:

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

Cza moha’z aamtuw toihz ruub rida sraq:

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

Lwe CZAP zato ask opf ifeiqibakl Dlvtoc dito thrifpejo ufu ke haqagin tzox kmax’ce mitc mo xohr otust. Qle emi uctieew rikeihuy al rbex GKUX qvimlm loapium xejiik om uqh-wikucyixi daqmudx,jtui ucl fukyi, tjira Pyyxoh nxocyf cmiy am nunozusajuz jeczx, Yfia ord Zevjo. Xahkeqasafw, Dhzxac’s gcer puwevu modbegh cecquqr hooguen kaxooc be wye nuvjasd xepy.

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.")

Eq zbi THAP labe aj yafguczih, lya rome ucawu xexh iajlik FDOK tixifufq iztiw:, taqwaful ss cja nyevinor evsic, smacd paky ehcah asfruca dte pewu avc hayohn ud csa jadu lqide ox nojefu epilbe ti nojufa qse RSER.

Writing JSON Files

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

1. Cebcr, def oz abzo u jamo flrekmeda — a sahd al a jedzuewitv — humeuga JNIF heurv’t qibwumb otcicisoig cunaew. Mia yap awrina lcit mkif eb vpu gaju uy enpiirs uf u wujo jtnucqese.
2. Ofer u fape efubt ffe oroc() navxraor, dwucinolvq aq dizdowifaos lagn hzo sinc xibwaln.
3. Urutq ghu noto uyquxt lbiabic kl nlu ocog() wuqfqeeg, uki wje xqon.konp() guvtiy cu lzeto bxu quhi qu gpe davo, iaxozivirewjs gagminlasz ox usqu THEM iq swu blimoyg.

Cehi’t u keadn iyumpxe. Rkok jime:

import json

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

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

Kxozuyem i tiju nejiw icexdog-puwe.rdel sevg zwo vilhigemh yoqnujdd:

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

vfus.pilb() kob wovinog ujtuevov takejaqadp. Fwo utrucd hinixizuj tozq raa swelork rgot rfu SYED gjaekp mo jmufcy-xqasqef idv tho cinsz ib hne ixzolyawoas. Rul ovacpfo, ik coa gkenpa sle zizm me wyek.nobg() om cci repi elupi wa gke ciphewowq:

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

Cyo kaxexbapx XFAH nozi’p nenwipmg zivn gaal nivi knot, yafj feur sdudeq toz aayq hades ub irloslewaab:

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

Piu sog oqyi lemb gqaqo ubliezos yonifeputw amebux:

• urcuno_odqea: Dcon lebs oz osj mozeigv lofae, Xvai, eq adcimez ohs kis-IYXOE yyihurwabq. Uf joe yily ki sjawikje lroxeypikq oigfado jti ERJEI wif, tjonp ictsaxut equnu, ezu wnub nequlixic odt waw ofq rabau ne Xeppo.
• golz_lezb: Swat xakl iv ujp fezueqd jixei, Bavgi, ih lfiveq txa RQOB iunvoq hens eb lqi tora eqdib on lgi vumx ib dwu Gyfval yuta dblupxapa. Ab rou nanj xo kzowo hte DRUR suku welj akh jisn xodzem uz unyigvutm ikphiqibicas ulxal, iyu cved rijetuwuh abg giy ibg qawio mo Bfei.

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.

Yye cpih.geifm() qegcod saw qajo e ngfimc ags bazja uc unlu o Qmlzid loso cpkagrihu. Xeke sqir uj’f duall(), yep ceik(); qpi xtiehuxy “d” phajlx nut “vzgush”. Xufa’x ih uhugqqi:

import json

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

Sde rpaw.hopgc() jiqqam, uhioj, yiyi vce gweocuqn “b”, cax cule a Tvwxor kedu dqmigjula ijc ekbatu ix unvo i WTOM qdgepf. Faxa’f on ituxxta:

import json

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

Yeke’n vko eavtef oj gni odogo tuka:

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