How to add string representation of hex?

Question

I have a bunch of hex as strings.

str = "e79"     # 0xe79
str2 = "1533a"  # 0x1533a
etc...

What's the best way to do some addition on these? For example, if I have str = "e79" and I want to add the decimal 37 to it to get str = "e9e"

Don't use `str` as a variable name; you are masking the built-in type. — Martijn Pieters, May 18 '15 at 07:39
Sorry, I was just using that a quick example. Thanks for your answer below! — user2378481, May 18 '15 at 07:49

score 6 · Accepted Answer · answered May 18 '15 at 07:37

6

You'll have to parse the values into integers if you want to do integer arithmetic; use int(hexstring, 16).

You can always convert back to the hex string representation using format():

result = format(int(strvalue, 16) + 37, 'x')

answered May 18 '15 at 07:37

Martijn Pieters

score 1 · Answer 2 · answered May 18 '15 at 07:39

1

    result = hex(int(str, 16) + int(str2, 16))

answered May 18 '15 at 07:39

sachin saxena

2

`hex()` should only be used if you want to produce Python's *hex literal notation*, which includes a `0x` prefix. – Martijn Pieters May 18 '15 at 07:46

2 Answers2