Act as a senior Python developer. Review the following code for efficiency, security, and style errors (PEP 8). Provide the refactored code and a detailed explanation of the changes.

Write an SEO-optimized blog post about [TOPIC]. Use a professional yet accessible tone. Include H2 and H3 headers, and an engaging meta description at the end.

/imagine prompt: A futuristic cyberpunk city street at night, neon lights reflecting on wet pavement, cinematic lighting, photorealistic, 8k, unreal engine 5 render --ar 16:9 --v 5.2

I have a dataset with the following columns: [COLUMNS]. I need you to act as an expert data analyst and suggest 3 advanced Excel formulas to extract valuable insights from this information.