Optimize pngs and remove the EXIF data embedded in them

optiexif.py

#!/usr/bin/python
import os
import subprocess

for root, dirs, files in os.walk("."):
    for file in files:
        if file.endswith(".png"):
             fpath = os.join.path(root,file)
             subprocess.call(["exiv2","delete",fpath]); subprocess.call(["optipng","-o7",fpath])