Extract .png files from a compiled sprite sheet Raw

spritesheetExtractor.py

import binascii
import re
import os

for directory, subdirectories, files in os.walk('.'):
    for file in files:

        if not file.endswith('.bin'):
            continue

        filenumber = 0

        with open(os.path.join(directory, file)) as f:

            hexaPattern = re.compile(
                r'(89504E47.*?49454E44AE426082)',
                re.IGNORECASE
            )

            for match in hexaPattern.findall(binascii.hexlify(f.read())):

                with open('{}-{}.png'.format(file, filenumber), 'wb+') as f:
                    f.write(binascii.unhexlify(match))

                filenumber += 1