import numpy as np;
import time
print(np.datetime64('2020-03-20')-np.datetime64('2020-02-20'))

#coding=gbk
import json

dicts={"name":"lucy","sex":"boy"}

json_dicts=json.dumps(dicts,indent=4)
print(json_dicts)

print(int(int(round(time.time() * 1000))))