Os.startfile in Windows.

[snippsat]

it is actually running and it is not allowing to edit the code.

This is in contradiction with fishhook's reply above. Now the problem is to understand what's going on. Does it do the same if you do

import webbrowser
webbrowser.open(<absolute path to your python file>)

It will all depend on what file association .py is set to in Windows.
If i set file association in Windows for .py to Notepad++,then this code will open hello.py in Notepad++.

import webbrowser

webbrowser.open(r'E:\div_code\hello.py')

If i chance back to root\python.exe will try to run hello.py.

Also what happens if you call

import os

os.startfile("spam.py", "edit")

edit is removed from most newer Windows version.
It will all fail with .py.

import os

# Work with know print formates  format like txt,pdf,images... 
os.startfile("test.txt", "print")

# Fail
os.startfile("hello.py", "print")