Python Developer for Ai-Powered Text Summarization Script with Api Integration

We are seeking a skilled Python developer to create a straightforward, AI-powered text summarization script. The primary function of this script will be to accept a block of text input from the user, process it through an external ai api (such as openai or a similar service), and then return a concise summary, ideally between 3 to 5 sentences long. The goal is to have a clean, easy-to-run script that provides consistent and clear summaries.

Project Requirements:
*  Develop a robust and user-friendly Python script.
*  Integrate an api call to a chosen ai model for efficient text summarization.
*  Ensure the script can handle user-pasted text as input.
*  The output summary must be short, consistent, and within the 3-5 sentence range.
*  Provide clear, brief instructions for installing any necessary dependencies and executing the script.
*  The code should be well-structured, readable, and prepared for immediate testing.

Deliverables:
*  A complete Python script (.py file) ready for execution.
*  A simple instruction manual (e.g., A README file or plain text document) detailing setup and usage.
*  (Optional) A GitHub repository link for the final code, demonstrating best practices.