Pre-order and Post-order results of executed meterpreter CMD in Python-MSFRPC

[alimp5]

Hi Metasploit development team,

OS:
Kali Linux

Metasploit Framework Version:
4.13.14-dev (installed via apt-get ...)

ruby-msgpack version:
1.0.0-1

python-msgpack version:
0.4.8-1

I'm using below Lib for interacting with Metasploit:
https://github.com/SpiderLabs/msfrpc/tree/master/python-msfrpc

When I pass a CMD via "session.meterpreter_run_single" to a specific session in python, for the first one, the result is OK. but when I change the CMD and pass to metasploit via RPC, I will get result of previous CMD; So I should run again the above API command to get correct result. :(

Please help me where is the problem and how i can fix this issue??

For reproduce this issue: plz for first time run the sysinfo CMD; for second time run this CMD. for third time, change the name of first CMD to getwd CMD and run the script;;; you will get result of previous CMD instead of new CMD(here: getwd) :(

My python-2.x script:
http://www.4shared.com/file/iOH6LpT9ba/alireza3.html

first time:

second time:

third time (I passed the getwd CMD, but i received the result of previous CMD) :

forth time:

Thanks in advance

[alimp5]

Here you are:

My uploaded python script on Paste-bin:
https://pastebin.com/NWKkmM13

Thanks