python 数组转成json

# !/usr/bin/env python
# -*- coding: utf-8 -*-
import cx_Oracle
from pprint import pprint
import csv
import time
import re
import binascii
import json

conn = cx_Oracle.connect('system/oracle@192.168.137.2/serv')
cursor = conn.cursor()
xsql='select * from tlcb_mon_device'
r = cursor.execute(xsql)
#print r
arr=[]
for x in r:
    #print x[1]
   #print x[1].decode('gbk').encode('utf-8')
    #print len(x[1])
    y=x[1].decode('gbk').encode('utf-8')
    #print len(y)
    #print  type(x)
    arr.append(x[0])
    #arr.append(y)
b=json.dumps(arr)
#print arr
#print type(arr)
print b
#print type(b)