Searching/reading binary data in Python

Question

I\'m reading in a binary file (a jpg in this case), and need to find some values in that file. For those interested, the binary file is a jpg and I\'m attempting to pick out

Answer 1

For Python >=3.2:

import re

f = open("filename.jpg", "rb")
byte = f.read()
f.close()

matchObj = re.match( b'\xff\xd8.*\xff\xc0...(..)(..).*\xff\xd9', byte, re.MULTILINE|re.DOTALL)
if matchObj:
    # https://stackoverflow.com/q/444591
    print (int.from_bytes(matchObj.group(1), 'big')) # height
    print (int.from_bytes(matchObj.group(2), 'big')) # width