My first python program

I’m learning python, so I figured I’d post my first little program.  This takes in command-line input arguments and converts the .pdf files to .png images.

#!/usr/bin/env python

# pdf2png converts pdf files to .png files

import sys, os

inputfilenames = sys.argv[1:]

for inputfilename in inputfilenames:
(fileBaseName, fileExtension)=os.path.splitext(inputfilename)
print 'filename=' + fileBaseName
newfilename=fileBaseName + '%d.png'
newfilenameSmall=fileBaseName + '%d_s.png'
cmd="convert -density 300 '" + inputfilename + "' -scale 720 -colors 256 -depth 8 -quality 90 '" + newfilename + "'"
os.system(cmd)