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Recipe 577243 revision 1 

from string import ascii_letters, digits, punctuation

filename = r'i:\Python\test.file'
file = open(filename, 'rb')
data = file.read()
file.close()

bytesRead = len(data)

def bufferToHex(buffer, start, count):
    accumulator = ''
    for item in range(count):
        accumulator += '%02X' % buffer[start + item] + ' '
    return accumulator

def bufferToAscii(buffer, start, count):
    accumulator = ''
    for item in range(count):
        char = chr(buffer[start + item])
        if char in ascii_letters or \
           char in digits or \
           char in punctuation or \
           char == ' ':
            accumulator += char
        else:
            accumulator += '.'
    return accumulator

index = 0
size = 20
hexFormat = '{:'+str(size*3)+'}'
asciiFormat = '{:'+str(size)+'}'

print()
while index < bytesRead:
    
    hex = bufferToHex(data, index, size)
    ascii = bufferToAscii(data, index, size)

    print(hexFormat.format(hex), end='')
    print('|',asciiFormat.format(ascii),'|')
    
    index += size
    if bytesRead - index < size:
        size = bytesRead - index

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