Why Python 4.0 Is Not Coming in 2026

In this episode, Lucas and Luna explore why the Python community is deliberately holding off on a Python 4.0 release despite increasing pressure from performance-hungry domains like AI inference and real-time data pipelines. They unpack the core tension: Python 3.x has become too stable and too widely embedded to risk a major version break. The discussion focuses on the Python Steering Council's recent rejection of a 4.0 proposal, the migration costs that would dwarf any theoretical benefit, and how the ecosystem is instead evolving through PEPs that add optional static typing, subinterpreters, and a JIT compiler without bumping the major version number. Specific numbers include 200 million lines of production Python code affected and a projected 3-5 year migration cost of $1.2 billion across the Fortune 500. The episode closes with a look at whether other languages like Rust or Mojo might fill the performance gap Python is leaving on the table. #Python #Python4 #ProgrammingLanguages #SoftwareEngineering #TechPodcast #OpenSource #PEP #Performance #JITCompiler #StaticTyping #Subinterpreters #SteeringCouncil #Fortune500 #MigrationCost #AI #Inference #Mojo #Rust Keep every episode free: buymeacoffee.com/fexingo