OptInt type function in Python
You can use dict.get to provide a default value as the second argument.
For example:
from math import nan

for obj in response:
    mass.append(obj.get('mass', nan))
    fall.append(obj.get('fall', nan))
    year.append(obj.get('year', nan))


import pandas as pd
import json

    mass=[]
    fall=[]
    year=[]

req = requests.get("https://data.nasa.gov/resource/y77d-th95.json")
response =req.json()

for i in range(0,len(response)):
    mass.append(response[i]['mass']) 
    fall.append(response[i]['fall'])
    year.append(response[i]['year'])

I handle keyError with the help of Exception handling. If i got keyerror i added NAN value.
As java have function like OptString whenever we get keyerror it add default value.
I just want to get all data in list but via using optString type method.
Can you give any example ?
Thanks ,
