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Improve NoRegionError message with guidance on setting a region #3731

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Improve NoRegionError message with guidance on setting a region #3731

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b210684
Improve NoRegionError message with guidance on setting a region
viveka76 Jun 21, 2026
1621af6
added tests
viveka76 Jun 21, 2026
ddd9824
Apply suggestion from @SamRemis
viveka76 Jul 1, 2026
d9fc018
Update tests/unit/test_regions.py
viveka76 Jul 1, 2026
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5 changes: 5 additions & 0 deletions .changes/next-release/enhancement-Endpoints-18366.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
{
"type": "enhancement",
"category": "Endpoints",
"description": "Improve the NoRegionError message to explain how to set a region (region_name, AWS_DEFAULT_REGION, or ~/.aws/config)."
}
6 changes: 5 additions & 1 deletion botocore/exceptions.py
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Expand Up @@ -243,7 +243,11 @@ class BaseEndpointResolverError(BotoCoreError):
class NoRegionError(BaseEndpointResolverError):
"""No region was specified."""

fmt = 'You must specify a region.'
fmt = (
'You must specify a region. This can be done by passing the region_name '
'argument to the client or session, using the AWS_DEFAULT_REGION '
'environment variable, or setting "region" in the aws config file.'
)


class EndpointVariantError(BaseEndpointResolverError):
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