Find ASCII characters in a binary file with Python

find_ascii_in_binary.py

# find_ascii_in_binary.py - Identify ASCII characters in binary files

import sys
from functools import partial

chunk_size = 1
with open(sys.argv[1], 'rb') as in_file:    
    for data in iter(partial(in_file.read, chunk_size), b''):
        x = int.from_bytes(data, byteorder='big')
        if (x > 64 and x < 91) or (x > 96 and x < 123) :
            sys.stdout.write(chr(x))
        else:
            sys.stdout.write('.')