Python3处理JSON格式的数据

JSON字符串与字典互相转换

[
  {
    "name": "iPhone9",
    "price": 9999,
    "count": 3000
  },
  {
    "name": "Tesla",
    "price": 800000,
    "count": 122
  }
]

import json

data = {'name': 'Alex', 'company': 'Google', 'age': 34}
# 将字典转换为JSON字符串
jsonStr = json.dumps(data)
print(type(jsonStr))  # 
print(jsonStr)  # {"name": "Alex", "company": "Google", "age": 34}

# 从json文件读取数据转换为字典
with open('products.json', 'r') as f:
    jsonStr = f.read()
    j_obj = json.loads(jsonStr)
    print(type(j_obj))  # 
    for k in j_obj:
        print(type(k))  # 
        for key, val in k.items():
            print("%s --> %s" % (key, val))

类实例列表与JSON字符串互相转换(json文件数据同上)

class Product:
    def __init__(self, dic):
        self.__dict__ = dic


f = open('products.json', 'r')
jsonStr = f.read()
# 将JSON字符串转换为Product对象列表
products = json.loads(jsonStr, object_hook=Product)
for p in products:
    print('name = ', p.name)
    print('price = ', p.price)
    print('count = ', p.count)
f.close()


# 定义将Product对象转换为字典的函数
def product2dict(product):
    return {
        'name': product.name,
        'price': product.price,
        'count': product.count
    }


# 将Product对象列表转换为JSON字符串
jsonStr = json.dumps(products, default=product2dict, ensure_ascii=False)
print(jsonStr)

转载于:https://my.oschina.net/zerobit/blog/3080918