CODEWITHSUNDEEP
pythonlistextract
csaboable
csaboable

Reputation: 173

Pythonic way to extract region name from zone (AWS/GCloud)

I'm new to Python and I was wondering, what is the best way to extract the region's name from a zone name.

For example:

GCP:

 - us-east1-c
 - europe-west2-b

AWS:

 - eu-west-2
 - ap-northeast-1

In bash, I would use:

echo "zone"|rev|cut -f2- -d-|rev"

In Python, I used:

'-'.join(zone.split('-')[:-1]),

I know it doesn't really matter, but I would like to do it in the pythonic way.

Thanks in advance!

Oh, expected output is if zone is us-east1-b

us-east1

Upvotes: 1

Views: 219

Answers (3)

Владислав Стадник
Владислав Стадник

Reputation: 43

It seems like only correct way to do it is to use regex. I've tested following example on two totally different zones, and it seems to work:

zone = "ap-southeast-1-bkk-1a"
zone2 = "us-east-1a"
region_regex = r'(.*?-\d+)'
match1 = re.match(region_regex, zone)
match2 = re.match(region_regex, zone2)
match1.group(1), match2.group(1)
# ('ap-southeast-1', 'us-east-1')

It won't make us-east1 from us-east1-b, of course. Don't know how AWS zones were named at the time you've asked the question, but now it is "us-east-1d"? If it is named this in Google Cloud,I guess you'll need some extra work to adapt the regex formula for your case and use both of them for each cloud separately.

UPD: Maybe it's a little out of context, and "ap-southeast-1-bkk" seems to be a Local Zone. But the fact of this approach works for both AZ and Local AZ makes it a more universal option.

Upvotes: 0

Austin
Austin

Reputation: 26039

I think this is enough using rsplit:

zone = 'us-east1-b'
print(zone.rsplit('-', 1)[0])
# us-east1

Or simply split will do:

zone = 'us-east1-b'
lst = zone.split('-')
print("{}-{}".format(lst[0], lst[1]))
# us-east1

Upvotes: 2

Ankush Rathi
Ankush Rathi

Reputation: 620

ok based on your comments I see String slicing will do the work for you. Read more about it here

Try this - print "us-east1-b"[:-2]

Upvotes: 0

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