Python 3.10's cool new match statement

[Edward K. Ream]

Python 3.10 supports the new match statement. Don't panic, match is a "soft" keyword.

Imo, this is the coolest addition to python since acyncio:

- Pep 634 describes the feature,

- Pep 635 gives the rationale,

- Pep 635 is a tutorial.

Leo issue #2541provides support for the required new ast parse-tree nodes.

I'm still trying to get my head around the "declarative" style of pattern matching. It might be possible to improve Leo's fast-read algorithm using this feature.

It is possible to (conditionally) use the match statement in Leo's code. The trick would be to put the new code in a separate file, say leoPython3.10.py. To use the new code, you would try to import functions from this file, falling back to legacy code if the import failed.

Edward

[Zoom.Quiet]

super, guido's new tutorial

Edward K. Ream <edre...@gmail.com> 于2022年4月1日周五 21:39写道：

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[Edward K. Ream]

On Fri, Apr 1, 2022 at 8:08 PM Zoom.Quiet <zoom....@gmail.com> wrote:

super,  guido's new tutorial

Glad you like it.  For the record, the tutorial is PEP 636, not 635 as I incorrectly said. Appendix A is a quick summary.

Edward