import os, fnmatch


print(">>> Convert")
for filename in os.listdir("./"):
    if fnmatch.fnmatch(filename, "*.png"):
        print(filename)
        os.system("pngquant --skip-if-larger --quality=80 --strip --output ./%s.new  ./%s" % (filename, filename))

print("\n>>> Copy")
for filename in os.listdir("./"):
    if fnmatch.fnmatch(filename, "*.new"):
        print(filename)
        os.remove("./" + filename[:-4])
        os.rename("./" + filename, "./" + filename[:-4])