import threading

class class_ins:
    _instance_lock = thr0eading.Lock()
    def __init__(self):
        print('__init__')
        if hasattr(self, 'tile_dbs'):
            return
        print('__init__ later')
        self.tile_dbs = dict()
    #Single Class
    def __new__(cls, *args, **kwargs):
        print(cls, args, kwargs)
        print(type(cls))
        print(cls.__name__)
        if not hasattr(eval(cls.__name__), "_instance"):
            with eval(cls.__name__)._instance_lock:
                if not hasattr(eval(cls.__name__), "_instance"):
                    eval(cls.__name__)._instance = object.__new__(cls)
        return eval(cls.__name__)._instance
    def __del__(self):
        pass

a = class_ins()

import json
import csv

# Opening JSON file and loading the data
# into the variable data
with open('data.json') as json_file:
    data = json.load(json_file)
 
employee_data = data['emp_details']
 
# now we will open a file for writing
data_file = open('data_file.csv', 'w')
 
# create the csv writer object
csv_writer = csv.writer(data_file)
 
# Counter variable used for writing 
# headers to the CSV file
count = 0
 
for emp in employee_data:
    if count == 0:
        # Writing headers of CSV file
        header = emp.keys()
        csv_writer.writerow(header)
        count += 1
 
    # Writing data of CSV file
    csv_writer.writerow(emp.values())
 
data_file.close()