json 文件读写

#coding=utf-
import json
data ={"update_time":"","version":"0.0.0","desc":{"hdw":{"desc":{"power":"1.0.0","motor":"1.0.0","imu":"1.0.0","sensor":"1.0.1"},"version":"0.0.2"},"soft":{"desc":{"web":"1.0.0","server":"1.0.0","base":"1.0.0"},"version":"0.0.1"}}}

#写入
with open('tmp.json', 'w') as f:
    json.dump(data, f)
try:
    with open('tmp.json', 'r') as f:
        k=json.load(f)
        print(k)
except ValueError:
        print("empty!")

#output
#{u'update_time': u'', u'version': u'0.0.0', u'desc': {u'hdw': {u'version': u'0.0.2', u'desc': {u'imu': u'1.0.0', u'sensor': u'1.0.1', u'power': u'1.0.0', u'motor': u'1.0.0'}}, u'soft': {u'version': u'0.0.1', u'desc': {u'web': u'1.0.0', u'base': u'1.0.0', u'server': u'1.0.0'}}}}