On 15/01/24 1:28 am, Left Right wrote:
Python isn't a context-free language, so the grammar that is used to describe it doesn't actually describe the language
Very few languages have a formal grammar that *fully* describes the set of strings that constitute valid programs, including all the rules about things having to be declared, types matching up, etc. The only one I know of which attempted that is Algol 68, and it seems to be regarded as a technical success but a practical failure.
... so, it's a "pretend grammar" that ignores indentation.
Indentation isn't ignored, it appears in the grammar by means of INDENT and DEDENT lexical tokens. It's true that the meaning of these tokens is described informally elsewhere, but that's true of all the lexical features. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
