Two ways of creating Python dictionaries (JSON and normal python)

#the two ways of creating python dictionaries - found here: link 1 - https://pastebin.com/hxCDvCpx + link 2 - https://pastebin.com/bf6VBk4X
#link 1 = json
#link 2 = normal
dict1 = {
  "brand": "FIAT",
  "model": 500,
  "year": 1957-1975,
  "amount": 3,893,294
}
print(dict1)
#normal python - link 2
import json
x = '{"first_name":"Jack", "last_name":"Jonas"}'
y = '{"first_name":"James", "last_name":"Johnson"}'
z = '{"first_name":"Jude", "last_name":"Jonathon"}'
#json python - link 1