Version 3.0.8 -

• API CHANGE: modified pyproject.toml to require Python version 3.6.8 or later for pyparsing 3.x. Earlier minor versions of 3.6 fail in evaluating the version_info class (implemented using typing.NamedTuple). If you are using an earlier version of Python 3.6, you will need to use pyparsing 2.4.7.

• Improved pyparsing import time by deferring regex pattern compiles. PR submitted by Anthony Sottile to fix issue 3x import-time performance regression between 2.x and 3.x #362, thanks!

• Updated build to use flit, PR by Michał Górny, added BUILDING.md doc and removed old Windows build scripts - nice cleanup work!

• More type-hinting added for all arithmetic and logical operator methods in ParserElement. PR from Kazantcev Andrey, thank you.

• Fixed infix_notation's definitions of lpar and rpar, to accept parse expressions such that they do not get suppressed in the parsed results. PR submitted by Philippe Prados, nice work.

• Fixed bug in railroad diagramming with expressions containing Combine elements. Reported by Jeremy White, thanks!

• Added show_groups argument to create_diagram to highlight grouped elements with an unlabeled bounding box.

• Added unicode_denormalizer.py to the examples as a demonstration of how Python's interpreter will accept Unicode characters in identifiers, but normalizes them back to ASCII so that identifiers print and 𝕡𝓻ᵢ𝓃𝘁 and 𝖕𝒓𝗂𝑛ᵗ are all equivalent.

• Removed imports of deprecated sre_constants module for catching exceptions when compiling regular expressions. PR submitted by Serhiy Storchaka, thank you.