pdflatex python script with latex/bibtex/latex/latex and moving unwanted files into output-directory

pdflatex.py

#!/usr/bin/env python
# -*- coding: utf-8 -*- 

import sys
import os
import shutil

pdflatex_bin = 'pdflatex'
bibtex_bin = 'bibtex'

move_extensions = ('.log', '.aux', '.bbl', '.blg')

# checking for output directory
output_directory = None
args = []
for arg in sys.argv:
    if 'output-directory' in arg:
        output_directory = arg.split('=')[-1].strip()
        continue
    args.append(arg)
        
        
pdflatex_cmd = "{0:s} {1:s}".format(pdflatex_bin, ' '.join(args[1:]))
bibtex_cmd = "{0:s} {1:s}".format(bibtex_bin, args[-1].replace('.tex', ''))

print pdflatex_cmd
print bibtex_cmd

if output_directory and not os.path.exists(output_directory):
    os.mkdir(output_directory)
    
os.system(pdflatex_cmd)
os.system(bibtex_cmd)
os.system(pdflatex_cmd)
os.system(pdflatex_cmd)

if output_directory:
    for ext in move_extensions:
        fname = args[-1].replace('.tex', ext)
        try:
            shutil.move(fname, os.path.join(output_directory, fname))
        except IOError:
            print "** Failed to move {0:s}".format(fname)