snmp_facts cannot find pysnmp

[hzj...@foxmail.com]

hello，

    i want to use snmp_facts module ,  and i installed the  pysnmp, 

    but everytime i execute the module, returns the error  "msg": "Missing required pysnmp module (check docs)"

    i really can not figure it out,  need some help;

    and i tried to import manully bye command line, there is no error on that: 

(AnsibleCmdb) [yd_hzj@localhost ansible-snmp-facts-master]$ python 
Python 2.7.5 (default, Jul 31 2016, 13:13:56) 
[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> from pysnmp.entity.rfc3413.oneliner import cmdgen
>>> 

    here is my playbook output 

(AnsibleCmdb) [yd_hzj@localhost ansible-snmp-facts-master]$  ansible-playbook snmp_facts-playbook.yml -i 10.223.53.3,  -vvv
Using /home/yd_hzj/project/rango/ansible/ansible.cfg as config file

PLAYBOOK: snmp_facts-playbook.yml **********************************************
1 plays in snmp_facts-playbook.yml

PLAY [10.223.53.3] *************************************************************

TASK [Get SNMP information from switches] **************************************
task path: /home/yd_hzj/test/ansible-snmp-facts-master/snmp_facts-playbook.yml:6
<10.223.53.3> ESTABLISH LOCAL CONNECTION FOR USER: yd_hzj
<10.223.53.3> EXEC /bin/sh -c 'LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python && sleep 0'
fatal: [10.223.53.3]: FAILED! => {"changed": false, "failed": true, "invocation": {"module_args": {"authkey": null, "community": "aaabbb", "host": "10.223.53.3", "integrity": null, "level": null, "privacy": null, "privkey": null, "removeplaceholder": null, "username": null, "version": "v2"}, "module_name": "snmp_facts"}, "msg": "Missing required pysnmp module (check docs)"}

NO MORE HOSTS LEFT *************************************************************
        to retry, use: --limit @snmp_facts-playbook.retry

PLAY RECAP *********************************************************************
10.223.53.3                : ok=0    changed=0    unreachable=0    failed=1