Code a combination generator

I am looking to hire a Freelancer to code a combination generator using any programming language. The generator should have the capability of handling larger sets (millions of possible combinations ) , but I'm not sure of the specific requirements for the output. The code should be well-documented and optimized for performance. This project requires expertise in Python and experience in coding efficient algorithms. If you feel up to the challenge, please submit a proposal so we can get started. Thanks!