13 posts tagged with "devops"

The NoRegionError in Boto3, the AWS SDK for Python, usually occurs when the AWS client or resource is initialized without specifying a region, and no default region is set in your AWS configuration.

In modern software engineering, the phrase "shift left" has transitioned from DevOps terminology to a core development philosophy. Rather than representing a tool or a command-line utility, shifting left is an architectural mindset.

Whether you are writing Python or building complex distributed services, understanding this approach will help you build reliable systems, discover bugs earlier, and shorten deployment cycles.

This guide explains the Shift Left model, demonstrates how to apply it in Python projects, and explores other development paradigms that complement it.

When defining server URLs in OpenAPI specs, you often need to reference environment-specific values (like staging or production subdomains). But using raw environment variables can result in placeholder values like default: unknown, which may confuse tools like Swagger UI, ReDoc, or code generators.

This guide explains the issue and offers clean solutions - with practical examples.