$ python nc_show_version.py
Response as XML String:
<?xml version="1.0" encoding="ISO-8859-1"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:if="http://www.cisco.com/nxos:1.0:if_manager" xmlns:nfcli="http://www.cisco.com/nxos:1.0:nfcli" xmlns:nxos="http://www.cisco.com/nxos:1.0" xmlns:vlan_mgr_cli="http://www.cisco.com/nxos:1.0:vlan_mgr_cli" xmlns:mod="http://www.cisco.com/nxos:1.0:sysmgrcli" message-id="urn:uuid:6b917998-4db6-11e6-9d80-080027cee472">
 <data>
  <mod:show>
   <mod:version>
    <mod:__XML__OPT_Cmd_sysmgr_show_version___readonly__>
     <mod:__readonly__>
      <mod:header_str>Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Documents: http://www.cisco.com/en/US/products/ps9372/tsd_products_support_series_home.html
Copyright (c) 2002-2016, Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained herein are owned by
other third parties and are used and distributed under license.
Some parts of this software are covered under the GNU Public
License. A copy of the license is available at
http://www.gnu.org/licenses/gpl.html.

NX-OSv is a demo version of the Nexus Operating System
</mod:header_str>
      <mod:loader_ver_str>N/A</mod:loader_ver_str>
      <mod:kickstart_ver_str>7.3(1)D1(1) [build 7.3(1)D1(0.10)]</mod:kickstart_ver_str>
      <mod:sys_ver_str>7.3(1)D1(1) [build 7.3(1)D1(0.10)]</mod:sys_ver_str>
      <mod:kick_file_name>bootflash:///titanium-d1-kickstart.7.3.1.D1.0.10.bin</mod:kick_file_name>
      <mod:kick_cmpl_time> 1/11/2016 16:00:00</mod:kick_cmpl_time>
      <mod:kick_tmstmp>02/22/2016 23:39:33</mod:kick_tmstmp>
      <mod:isan_file_name>bootflash:///titanium-d1.7.3.1.D1.0.10.bin</mod:isan_file_name>
      <mod:isan_cmpl_time> 1/11/2016 16:00:00</mod:isan_cmpl_time>
      <mod:isan_tmstmp>02/23/2016 01:43:36</mod:isan_tmstmp>
      <mod:chassis_id>NX-OSv Chassis</mod:chassis_id>
      <mod:module_id>NX-OSv Supervisor Module</mod:module_id>
      <mod:cpu_name>Intel(R) Xeon(R) CPU E5-2670</mod:cpu_name>
      <mod:memory>4002312</mod:memory>
      <mod:mem_type>kB</mod:mem_type>
      <mod:proc_board_id>TM29D1D533B</mod:proc_board_id>
      <mod:host_name>nxosv</mod:host_name>
      <mod:bootflash_size>1582402</mod:bootflash_size>
      <mod:kern_uptm_days>2</mod:kern_uptm_days>
      <mod:kern_uptm_hrs>21</mod:kern_uptm_hrs>
      <mod:kern_uptm_mins>1</mod:kern_uptm_mins>
      <mod:kern_uptm_secs>51</mod:kern_uptm_secs>
      <mod:manufacturer>Cisco Systems, Inc.</mod:manufacturer>
     </mod:__readonly__>
    </mod:__XML__OPT_Cmd_sysmgr_show_version___readonly__>
   </mod:version>
  </mod:show>
 </data>
</rpc-reply>
=================================
Chassis ID:  NX-OSv Chassis
Software Version:  7.3(1)D1(1) [build 7.3(1)D1(0.10)]


################################################################

#!/usr/bin/env python

from ncclient import manager

if __name__ == '__main__':

    with manager.connect(host='nxosv', port=22, username='cisco', password='cisco',
                         hostkey_verify=False, device_params={'name': 'nexus'},
                         allow_agent=False, look_for_keys=False) as device:

        commands = ['config t', 'interface Ethernet2/6', 'switchport', 'description Configured by Python ncclient']
        nc_config_reply = device.exec_command(commands)
        print nc_config_reply.xml

################################################################