![]() ![]() The energy levels of the two particles are similar to that of the hydrogen atom (which is a bound state of a proton and an electron). The system is unstable: the two particles annihilate each other to predominantly produce two or three gamma-rays, depending on the relative spin states. Positronium is a system consisting of an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium. More resourcesĪnd now for something completely different You can read the Steering Council communication about it here to learn more. ![]() In previous pre-releases but it has been postponed to Python 3.11 due to some compatibility concerns. PEP 597 - Add optional EncodingWarningīpo-38605: from _future_ import annotations ( PEP 563) used to be on this list.PEP 624 - Remove Py_UNICODE encoder APIs.PEP 644 - Require OpenSSL 1.1.1 or newer.PEP 636 - Structural Pattern Matching: Tutorial.PEP 635 - Structural Pattern Matching: Motivation and Rationale.PEP 634 - Structural Pattern Matching: Specification.bpo-12782: Parenthesized context managers are now officially allowed. ![]()
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