Python 3.9 rolled out an entirely new parser - faster, more robust, easier for the Python team to maintain, and less riddled with internal hacks. Python’s error reporting has long been at the mercy of the whims of its parser.
#Python 3.10 how to
For example: command = input() match command.split(): case : quit() case : load_from(filename) case : save_to(filename) case _: print (f"Command '' not understood")įor more details on how to use pattern matching, see our how-to on this new syntax.
#Python 3.10 code
This greatly expands the range of possibilities, and makes it possible to write code that quickly encompasses a variety of scenarios. But it also allows you to match against patterns of values - e.g., an object with a certain property set to a certain value. Files Versionįor macOS 10.An outgrowth of previous failed attempts to add a switch/case-like syntax to Python, structural pattern matching lets you match variables against one of a set of possible values (as with switch/case in other languages). Therefore, the twin paradox is not a paradox in the sense of a logical contradiction. In both views, there is no symmetry between the spacetime paths of the twins. However, this scenario can be resolved by realising that the travelling twin is undergoing acceleration, which makes him a non-inertial observer. This result appears puzzling because each twin sees the other twin as moving, and so, as a consequence of an incorrect and naive application of time dilation and the principle of relativity, each should paradoxically find the other to have aged less. In physics, the twin paradox is a thought experiment in special relativity involving identical twins, one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more. More resourcesĪnd now for something completely different The next pre-release of Python 3.10 will be 3.10.0b1 ( the first beta release and feature freeze), currently scheduled for Monday. (Hey, fellow core developer, if a feature you find important is missing from this list, let Pablo know.)
This is an early developer preview of Python 3.10 Major new features of the 3.10 series, compared to 3.9
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