1)

import requests # requests

r = requests.get('http://spartacodingclub.shop/sparta_api/seoulair')

rjson = r.json()

print(rjson)

2)

import requests # requests

r = requests.get('http://spartacodingclub.shop/sparta_api/seoulair')

rjson = r.json()

print(rjson['RealtimeCityAir']['row'])

3)

import requests # requests

r = requests.get('http://spartacodingclub.shop/sparta_api/seoulair')

rjson = r.json()

rows = rjson['RealtimeCityAir']['row']

for a in rows:

    print(a)

1, 2, 3번 코드의 출력값의 차이가 뭔가요?