android - How to save information in json file without deleting previous information python -

i making app using python , kivy allows user make new entry glucose readings. right saves json file new entry deletes previous data. how can make each entry saves separately can access information user's history?

.py file

from kivy.app import app kivy.lang import builder kivy.uix.popup import popup kivy.uix.button import button kivy.graphics import color, rectangle kivy.uix.boxlayout import boxlayout kivy.uix.floatlayout import floatlayout kivy.uix.image import asyncimage kivy.uix.label import label kivy.properties import stringproperty, listproperty kivy.uix.behaviors import buttonbehavior kivy.uix.textinput import textinput kivy.network.urlrequest import urlrequest kivy.storage.jsonstore import jsonstore os.path import join os.path import exists kivy.compat import iteritems kivy.storage import abstractstore json import loads, dump kivy.config import config import os import errno    class phone(floatlayout):     def __init__(self, **kwargs):         # make sure aren't overriding important functionality         super(phone, self).__init__(**kwargs)      self.canvas.before:         color(0, 1, 0, 1)  # green; colors range 0-1 instead of 0-255         self.rect = rectangle(size=self.size, pos=self.pos)      self.bind(size=self._update_rect, pos=self._update_rect)       if not os.path.exists('hello.json'):         open('hello.json', 'wt') infile:             infile.write("")      else:         open('hello.json') infile:             try:                 data = phone.load(self)             except keyerror:                 data = []  def _update_rect(self, instance, value):     self.rect.pos = instance.pos     self.rect.size = instance.size  def product(self, instance):     self.result.text = str(float(self.w.text) * 703/ (float(self.h.text) * float(self.h.text)))  def save(self):     store = jsonstore('hello.json')     name = self.n.text     gender = self.g.text     dtype = self.t.text     height = self.h.text     weight = self.w.text     bmi = self.result.text     medications = self.m.text     insulin = self.ti.text     store.put('profile', name=name, gender=gender, dtype=dtype, height=height, weight=weight, bmi=bmi, medications=medications, insulin=insulin)   def save_entry(self):     time = self.gt.text     glucose = self.gr.text     carbs = self.c.text     medications_taken = self.mt.text     store.put('entry', time=time, glucose=glucose, carbs=carbs, medications_taken=medications_taken)    def load(self):     store = jsonstore('hello.json')     profile = store.get('profile')     self.n.text = profile['name']     self.g.text = profile['gender']     self.t.text = profile['dtype']     self.h.text = profile['height']     self.w.text = profile['weight']     self.result.text = profile['bmi']     self.m.text = profile['medications']     self.ti.text = profile['insulin']       presentation = builder.load_file("main.kv")  class phoneapp(app):     def build(self):         store = jsonstore('hello.json')          return phone()    if __name__ == '__main__':     phoneapp().run() 

use small json database this keep clean. example usage:

from tinydb import tinydb, query  db = tinydb('./db.json') user = query() db.insert({'name': 'john', 'age': 22}) result = db.search(user.name == 'john') print result