python获取json数据计算使用率

import json

reque = {"totalCpu":1792,"totalMemory":7571293794304,"availableMemory":4110623895552,
         "success":123,"managedCpuNum":448,"availableCpu":660,"capacityData":
             [{"resourceUuid":"2b0273bf1dba422d9d8bcc02bf7dbdfe","totalCpu":1792,
               "availableCpu":660,"totalMemory":7571293794304,"availableMemory":4110623895552,
               "managedCpuNum":448}],"resourceType":"ClusterVO"}
def cpumem():

    apps = []
    # 获取 ['inventories']的子项
    for a in reque['capacityData']:
        uuid = a['resourceUuid']
        total_cpu = a['totalCpu']
        available_cpu = a['availableCpu']
        managedCpuNum = a['managedCpuNum']
        total_mem = a['totalMemory']
        available_mem = a['availableMemory']
        apps.append({
            'zstack': {
                'cpumem': {
                    'uuid': uuid,
                    'total_cpu': total_cpu,
                    'available_cpu': available_cpu,
                    'cpu_usage_pct': round(((1 - (available_cpu/total_cpu)) * 100),2),
                    'managedCpuNum': managedCpuNum,
                    'total_mem': total_mem,
                    'mem_usage_pct': round(((1 - (available_mem/total_mem)) * 100),2),
                    'available_mem': available_mem
                }
            }
        })
    return apps

json_string = json.dumps(cpumem())
print(json_string)

[{"zstack": {"cpumem": {"uuid": "2b0273bf1dba422d9d8bcc02bf7dbdfe", "total_cpu": 1792, "available_cpu": 660, "cpu_usage_pct": 63.17, "managedCpuNum": 448, "total_mem": 7571293794304, "mem_usage_pct": 45.71, "available_mem": 4110623895552}}}]