Using python to write hex to file

Question

I am trying to create a bunch of binary files that contain corresponding hex values

for i in range(2**8):
    file = open("test" + str(i) + ".bin", "wb")
    file.write(hex(i))
    file.close()

Unfortunately it appears that a text representation of my counter converted to hex is being written to the files instead of the actual hex values. Can someone please correct this code? I'm sure the problem is with hex(i)

Well, yes... hex(x) docs specifically say that it returns a string. docs.python.org/3/library/functions.html#hex But hex is a representation: do you want to write the binary representation of that hex string? Or the binary representation of i? — Matt Ball
– Matt Ball, Commented Jan 24, 2013 at 3:03
I suppose you want to write the binary value of i instead of literal value of i to file? — Marcus
– Marcus, Commented Jan 24, 2013 at 3:04

wim · Accepted Answer · 2013-01-24 03:15:51Z

5

If you want the value to be written in binary, use chr() to create the character from i:

for i in range(2**8):
    with open("test" + str(i) + ".bin", "wb") as f:
        f.write(chr(i))

edited Jan 24, 2013 at 3:15

wim

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answered Jan 24, 2013 at 3:12

Raymond Hettinger

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