How do you convert a hex string into hex?

Question

I've got a list of hex strings.

mylist = ['0xff', '0x34', '0x95', '0x11']

I'd like to get this list into another list, but in hex format. Thus the list should look something like this.

myhexlist = ['\xff', '\x34', '\x95', '\x11']

What I've tried:

#!/usr/bin/env python

myhexlist = []
mylist = ['0xff', '0x34', '0x95', '0x11']

for b in mylist:
    myhexlist.append( hex(int(b,16)) )

print myhexlist

Which does not produce the desired output.

Why not just replace 0x with \x? For example, myhexlist = [i.replace("0x", "\\x") for i in mylist]. — Waleed Khan
– Waleed Khan, Commented Oct 16, 2013 at 20:00
That will keep the data type the same as a string. Nicholas's answer is what I was attempting to do. — user791953
– user791953, Commented Oct 16, 2013 at 20:13

Nicholas Riley · Accepted Answer · 2013-10-20 04:22:09Z

2

You want to use chr rather than hex (which just reverses the transformation).

Also, it's more efficient to use a list comprehension rather than a loop in which you're appending to a list.

>>> myhexlist = [chr(int(hex_str, 16)) for hex_str in mylist]
>>> myhexlist
['\xff', '4', '\x95', '\x11']

(obviously you're not going to get a \x## for a printable character).

edited Oct 20, 2013 at 4:22

answered Oct 16, 2013 at 20:06

Nicholas Riley

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