How to get all hosts by ZABBIX API

[Yaohua]

I use ZABBIX API to get all hosts.but the respone is null
As following is my code:

import urllib3
import json
Zabbix_Cusor = urllib3.PoolManager()
Zabbix_username = 'Admin'
Zabbix_pass = 'zabbix'
Zabbix_header = {"Content-Type":"application/json"}
Get_Hosts = json.dumps({
    "jsonrpc": "2.0",
    "method": "host.get",
    "params": {
        "output": "extend",
    },
})
b  = Zabbix_Cusor.request('POST',
                          Zabbix_url,
                          body=Get_Hosts,
                          headers=Zabbix_header)
try:
    User_Data = json.loads(b.data)['result']
    for i in User_Data:
        print(i, "\n")
except TypeError:
    print("No respone") 

please help me

[jan.garaj]

You don't have any authentication.

Why you don't use some existing library? http://zabbix.org/wiki/Docs/api/libraries#Python

[Yaohua]

You don't have any authentication.

Why you don't use some existing library? http://zabbix.org/wiki/Docs/api/libraries#Python

Yeah,I got it.Thanks.