Parsing a MAC address with python

Question

How can I convert a hex value "0000.0012.13a4" into "00:00:00:12:13:A4"?

@Shadow notice period vs colon – OneCricketeer Sep 11 '17 at 02:19 — OneCricketeer, Sep 11 '17 at 02:19

score 1 · Answer 1 · answered Sep 11 '17 at 02:34

1

text = '0000.0012.13a4'
text = text.replace('.', '').upper()   # a little pre-processing

# chunk into groups of 2 and re-join
out = ':'.join([text[i : i + 2] for i in range(0, len(text), 2)])   
print(out)

00:00:00:12:13:A4

answered Sep 11 '17 at 02:34

cs95

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cdlane · Answer 2 · 2017-09-11T02:44:51.253

0

import re

old_string = "0000.0012.13a4"

new_string = ':'.join(s for s in re.split(r"(\w{2})", old_string.upper()) if s.isalnum())

print(new_string)

OUTPUT

> python3 test.py
00:00:00:12:13:A4
>

Without modification, this approach can handle some other MAC formats that you might run into like, "00-00-00-12-13-a4"

edited Sep 11 '17 at 02:44

answered Sep 11 '17 at 02:39

cdlane

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score 0 · Answer 3 · answered Dec 08 '22 at 01:13

0

Try following code

import re
hx = '0000.0012.13a4'.replace('.','')
print(':'.join(re.findall('..', hx)))

Output: 00:00:00:12:13:a4

answered Dec 08 '22 at 01:13

hardika

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score -1 · Answer 4 · edited Jun 20 '20 at 09:12

-1

There is a pretty simple three step solution:

First we strip those pesky periods.

step1 = hexStrBad.replace('.','')

Then, if the formatting is consistent:

step2 = step1[0:2] + ':' + step1[2:4] + ':' + step1[4:6] + ':' + step1[6:8] + ':' + step1[8:10] + ':' + step1[10:12]
step3 = step2.upper()

It's not the prettiest, but it will do what you need!

edited Jun 20 '20 at 09:12

Community

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answered Sep 11 '17 at 02:25

Kirk Reynolds

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But your approach is giving me something like this 00:00:.0:01:2.:13 – chaitanya Sep 11 '17 at 02:32
Apologies, Try again - I misused the strip() method when the correct method was replace. I have confirmed it working now! – Kirk Reynolds Sep 11 '17 at 02:36
@chaitanya Definitely _not_ what you need. Don't hardcode ranges like this, it's bad practice. – cs95 Sep 11 '17 at 02:36

score -2 · Answer 5 · answered Sep 11 '17 at 02:16

-2

It's unclear what you're asking exactly, but if all you want is to make a string all uppercase, use .upper()

Try to clarify your question somewhat, because if you're asking about converting some weirdly formatted string into what looks like a MAC address, we need to know that to answer your question.

answered Sep 11 '17 at 02:16

Jordan Singer

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I want this mac address 0000.0012.13a4 to be converted to 00:00:00:12:13:A4. Changing period to colon and decimal spacing from every four digits to two. They both are same mac addresses. But I am looking for proper formatting – chaitanya Sep 11 '17 at 02:25

Parsing a MAC address with python

5 Answers5

First we strip those pesky periods.

Then, if the formatting is consistent: