json

#!/usr/bin/python3
import sys
from netaddr import IPAddress
from netmiko import ConnectHandler
import netmiko
import json

with open('external.json') as file:
    devices_list = json.load(file)


file.close()

netmiko_exceptions = (netmiko.ssh_exception.NetMikoAuthenticationException,
                    netmiko.ssh_exception.NetMikoTimeoutException
                    )


for device in devices_list:

        try:
            connection = ConnectHandler(**device)

            connection.enable()

            if device['device_type'] == 'cisco_nxos':
                hostname = connection.send_command('show hostname')
                licenseid = connection.send_command('show license host-id')
            else:
                hostname = connection.send_command('show run | i host')
                hostname = hostname.replace('hostname ', '')
                licenseid = 'License hostid: no license '

            connection.disconnect()

        except netmiko_exceptions as ex:
            print('Error occur with [{}]'.format(device["ip"]))
            print('The problem touches: {}'.format(ex))
        else:
            # print('else')
            print('Host [{}] {}  {}'.format(device['ip'], hostname, licenseid))
        # finally:
        #     print('final')



external.json
[
    {
        "ip":"10.1.100.90",
        "device_type":"cisco_nxos",
        "username":"admin",
        "password":"Cisco123$"
    },
    {
        "ip":"10.1.100.92",
         "device_type":"cisco_nxos",
         "username":"admin",
         "password":"Cisco123$q"
        },
    {
        "ip":"10.1.100.100",
        "device_type":"cisco_ios",
        "username":"admin",
        "password":"Cisco123$"
    }
]