Creation of new identifer

A new idea: “only” I came up with an idea for a new Python keyword called “only”. The idea is to check all available values and find the ones that satisfy a condition without having to manually write multiple loops or “if/else” statements. I know this can already be done in Python, but I thought it would be interesting to explore whether “only” could make this process simpler. What do you guys think? Is something like this already possible?