pngoutall.py

import os, time, sys

beforeSize = 0
afterSize = 0

startTime = time.time()

if sys.argv[-1] == '-r':
    for folderName, subfolders, filenames in os.walk('.'):
        for filename in filenames:
            if not filename.endswith('.png'):
                continue
            filename = os.path.join(folderName, filename)
            beforeSize += os.path.getsize(filename)
            os.system('pngout "%s"' % filename)
            afterSize += os.path.getsize(filename)

else:
    for filename in os.listdir('.'):
        if not filename.endswith('.png'):
            continue
        beforeSize += os.path.getsize(filename)
        os.system('pngout "%s"' % filename)
        afterSize += os.path.getsize(filename)

beforeSize = beforeSize // 1024
afterSize = afterSize // 1024
print('Time: %s\nBefore: %s kb\nAfter %s kb\nTotal Savings: %s kb' % (time.time() - startTime, beforeSize, afterSize, (beforeSize - afterSize)))