[Python] Python shell inside gdb

I have created a python script which starts an python console "pythonstart.py"

import sys
import subprocess
subprocess.call(['/usr/bin/python'])

I am sourcing it from inside gdb

gdb# source pythonstart.py

It gives an python console.

Problem: When I exit from python console, it returns to gdb, if I press "ENTER" again it again goes back to python console. I am not sure why its happening. Once I have quit the python console then why its coming back.

There is another situation: After exit from python, if I don't press "ENTER" on gdb but execute any command and then press "ENTER", problem does not appear.

(gdb)
(gdb) source pythonstart.py
Python 2.7.6 (default, Jun 22 2015, 18:00:18)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>>
>>> exit()
(gdb) <---- Pressing Enter here
Python 2.7.6 (default, Jun 22 2015, 18:00:18)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>>


I want to stop this from falling back to python console after pressing enter key. Please help.

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