Read on if your boto3 code is throwing this error:
botocore.exceptions.NoRegionError: You must specify a region.
But first, two reasons why you might only get this error in some situations:
- AWS lambda sets the region automatically. Code that works in lambda may still throw
- Some AWS services are global (don’t have regions). Like S3:
import boto3 s3 = boto3.resource('s3') bucket = s3.Bucket('my-buycket') for object in bucket.objects.all(): print(object.key)
This code will work without setting a region.
Those are edge cases. You’ll usually get a
NoRegionError unless you set a region. Like from this script on a laptop (it would work in lambda):
import boto3 cloudformation = boto3.client('cloudformation') cloudformation.list_stacks()
The docs have all the details of setting a region, but the cheap and easy answer is to add this to the top of your
~/.aws/config file (create it if it doesn’t exist):
[default] region = us-west-2
us-west-2 as an example. Replace that with the region you’re using.
There are more robust options and as you get farther with boto3 I recommend checking out the details in the link above, but this should get you moving again.
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