Before 3.11, if you ran multiple tasks and two failed with different errors, Python would raise the first exception and swallow the second. You would lose debugging information.
Notice the except* (star-except) syntax. It catches all ValueErrors inside the group without breaking the successful execution of task "B". Ask any developer: "What is the worst part of Python?" Many will answer: Tracebacks that only tell you the line, not the column. python 3.11
import tomllib with open("config.toml", "rb") as f: config = tomllib.load(f) print(config["tool"]["poetry"]["name"]) Before 3
Released in October 2022, Python 3.11 stands as a landmark update for the language. While the world has since moved to 3.12 and 3.13, 3.11 remains the bedrock for many production systems due to its maturity and significant, measurable improvements over Python 3.10. This update focused heavily on two core pillars: execution speed and error clarity . It catches all ValueErrors inside the group without
ExceptionGroup and except* .