Need help in python scripting

[DeaD_EyE]

import json
import csv


with open('/local/dummy.json') as f:
    json_data = json.load(f, strict=False)

with open('/local/application.csv', 'w') as outfile:
    csv_write = csv.writer(outfile)
    csv_write.writerow(["id", "SID", "Type", "ttt"])
    for x in json_data["dummy"]:
        try:
            row = x["id"], x["salary"][0]["SID"], x["ttt111"][0]["ttt"], x["ttt111"][0]["S"]
        except KeyError:
            # skip this row?
            # using a default fill value?
            continue # continue with next iteration, won't write the row
        csv_write.writerow(row)

Don't ask for permission, ask for forgiveness.
The try-except block handles the error. You can decide what you want to do, if the key does not exist.

Instead of re-opening the csv-file the whole time for only one row is inefficient.
Use the file-object outfile in the with-block instead. As long the for-loop is inside the with-block,
the file is still open and it would write.

By the way, why are you setting the default encoding?
A reload of sys direct after importing it, does not change anything.