read a json file and modify some content

# cat resize_json.py
# Python program to read
# json file
#https://www.geeksforgeeks.org/read-json-file-using-python/

import json
import shutil

target_json = "./new.json"
# JSON string
#a = '{"name": "Bob", "languages": "English"}'

# deserializes into dict
# and returns dict.
#y = json.loads(a)


# JSON file
f = open ('old.json', "r")

# Reading from file
data = json.loads(f.read())

# Iterating through the json
# list
for i in data['images']:
        #print(i['file_name'])
        base_name = i['file_name']


for i in data['annotations']:
        print("\n========\n")
        i['bbox'] = [ b/2 for b in i['bbox']]
        print("there are {} segmentation ".format(len(i['segmentation'])))
        for num in range(len(i['segmentation'])):
            print(i['segmentation'][num])
            i['segmentation'][num] = [ b/2 for b in i['segmentation'][num] ]
                #i['segmentation'] = [ b/2 ]

        i['width'] = int(i['width'] /2)
        i['height'] = int(i['height'] /2)

#data['images']['width'] = 2
for i in data['images']:
    i['width'] = int(i['width'] /2)
    i['height'] = int(i['height'] /2)

#print(data)
with open(target_json, "w") as j:
     json.dump(data, j)

# Closing file
f.close()

　　

 

https://stackoverflow.com/questions/21035762/python-read-json-file-and-modify