# Pastebin iXix6ij2
import json

new_log_dict = {"data1": [1, 2, 3]
                "data2": ["A", "B", "C"],
                "data3": 321}
             
try:
    logstxt_r = open('logs.txt','r')
    logs = json.load(open(logstxt_r))
    logstxt_r.close()
except FileNotFoundError:
    logs = []

logs.append(new_log_dict)
logstxt_w = open('logs.txt','w')
json.dump(logs,logstxt_w)
logstxt_w.close()