Split json file train and val

Suppose we have a image folder and annotation json folder but you need split train image and json, And other need val image and json.So you need to spit this json file what why this code may be

Annotation file and folder structure,

                        ├── data
                        │   ├── 24c59362285bbddc26a914866a6041cd.png
                        │   ├── ...................................
                        │   ├── ...................................
                        │   ├── ...................................
                        │   ├── ...................................
                        │   ├── ecommerce-wireframes-magorg-proddet.jpg
                        └── via_export_json.json
                   

Script,

import json
import shutil
import random
import os

path = "via_export_json.json"
img_dir = "data"
percentage = 20
li=[]
with open(path,"r") as f:
    data = json.load(f)
    # print(data)
    for i in data:
        x = (i,data[i])
        li.append(x)

lenght_li = int((len(li)*percentage)/100)
print(lenght_li)

train_list = li[4:]
val_list = li[:4]
train_dic = {}

train_path = "train/img"
if not os.path.exists(train_path):
    os.makedirs(train_path)

for train in train_list:
    train_dic[train[0]]=train[1]
    img_name = train[1]['filename']
    shutil.move(img_dir+"/"+img_name, train_path+"/"+img_name)
with open('train/data.json', 'w') as outfile:
    json.dump(train_dic, outfile) 

val_dic = {}
val_path = "val/img"
if not os.path.exists(val_path):
    os.makedirs(val_path)

for val in val_list:
    val_dic[val[0]]=val[1]
    img_name = val[1]['filename']
    shutil.move(img_dir+"/"+img_name, val_path+"/"+img_name)
with open('val/data.json', 'w') as outfile:
    json.dump(val_dic, outfile)

Result folder structure,

                      ├── train
                      │   ├── data.json
                      │   └── img
                      │       ├── f33abea8e5021d41911365156f84a943.png
                      │       ├── .....................................
                      │       ├── .....................................
                      │       └── united-business-html-website-template-1.jpg
                      ├── val
                      │   ├── data.json
                      │   └── img
                      │       ├── WB0412697.png
                      │       ├──...............
                      │       └── zurb-foundation-templates-2.JPG