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The lifetime requirement in PyO3 can be eliminated by using Rust's ownership system to manage the memory of objects and ensuring that all objects passed between Rust and Python are owned by either Rust or Python, but not both simultaneously. This involves carefully designing the API of the Rust code to expose only owned objects and using PyO3's API conventions for managing memory such as PyCell and PyRef. Additionally, the use of reference counting, garbage collection, or other memory management techniques may be considered depending on the specific requirements of the application.