How to convert hexadecimal word to signed integer in python 2-7?

Question

I am trying to write a method for converting hexadecimal words to signed integers. I want to use python 2-7. In python3 I can do the following

def word2int(hex_str):
    ba = bytes.fromhex(hex_str)
    return int.from_bytes(ba,byteorder='big',signed=True)

However, neither of these methods (i.e. fromhex and from_bytes) are defined in python 2-7. Are there any nice and simple methods of doing this in Python 2-7?

Have you tried the struct module? docs.python.org/2/library/struct.html — ssm
– ssm, Commented Jun 26, 2014 at 11:54

Kevin · Accepted Answer · 2014-06-26 12:13:01Z

2

Use int to convert to an unsigned integer, and then manually convert to signed.

def word_to_int(hex_str):
    value = int(hex_str, 16)
    if value > 127:
        value = value-256
    return value

answered Jun 26, 2014 at 12:13

Kevin

76.5k13 gold badges141 silver badges168 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user3774617 Over a year ago

Can't believe I didn't think of that! Seems to work for 16-bit strings as well, only with -65534 instead of -256.

Collectives™ on Stack Overflow

How to convert hexadecimal word to signed integer in python 2-7?

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related