Add a given .prj dependance to every AutoCAD DWG file found among a given folder structure

isogeo_team.prj

GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]

prj2dwg.py

# -*- coding: UTF-8 -*-
#!/usr/bin/env python
from __future__ import unicode_literals
#------------------------------------------------------------------------------
# Name:         OpenCatalog to Excel
# Purpose:      Add a given .prj dependance to every AutoCAD DWG file found.
#
# Author:       Julien Moura (@geojulien)
#
# Python:       2.7.x
# Created:      02/11/2015
# Updated:      --/--/--
#------------------------------------------------------------------------------

###############################################################################
########### Libraries #############
###################################

# Standard library
from os import walk, path         # files and folder managing
from shutil import copyfile

###############################################################################
######### Main program ############
###################################

# variables
li_dwg = []    # list of DWG paths
folder_target = r"\\nas.hq.isogeo.fr\SIG\SIG_DATA_SERVICE"    # folder structure to search for
prj = r"isogeo_team.prj"    # prj file to copy

# listing DWG files
for root, dirs, files in walk(folder_target):
    for f in files:
        """ looking for files with geographic data """
        try:
            unicode(path.join(root, f))
            full_path = path.join(root, f)
        except UnicodeDecodeError:
            full_path = path.join(root, f.decode('latin1'))
        # Looping on files contained
        if path.splitext(full_path.lower())[1] == '.dwg':
            """ listing DWG """
            # add complete path of DWG file
            li_dwg.append(full_path)

# looping on every DWG and adding the prj
for dwg in li_dwg:
    # print(path.join(path.dirname(dwg), path.basename(dwg)[:-4]) + ".prj")
    print(dwg)
    copyfile(prj, path.join(path.dirname(dwg), path.basename(dwg)[:-4]) + ".prj")