[jnxx]

> Let's count - 3rd-party patmatching libs for Python exists for 10-15 years. And only now some of those people who did their work as "third parties" came to do it inside mainstream Python.

Well, somewhat tongue-in-cheek, why not introduce a macro system into Python which allows to experimentally implement such syntactic changes as a library?

[pfalcon]

First of all, macro systems for Python exist for decades (just as long as pattern matching, and indeed, many patmatching implementations are done as macros). One well-know example of both is https://macropy3.readthedocs.io/en/latest/pattern.html

Secondly, there's a PEP to embrace macros in CPython (instead of pretending they don't exist, and leaving that to external libraries): https://www.python.org/dev/peps/pep-0638/

But the point, you don't need to wait for official PEP to use macros in Python. If you wanted, you could do that yesterday (== decades ago). And I guess in absolute numbers, the same amount of people use macros in Python as in Scheme. It's just in relative figures, it's quite different, given that there're millions of Python users.

[jnxx]

So, if it isn't finished, why do people not use pattern matching implemented as a macro, until things like scoping are ironed out?

[pfalcon]

For as long as you're a human and belong to category of "people", you can answer that question as good as anyone else. And your answer is ...?

(Just in case my answer is: https://github.com/pfalcon/python-imphook , yet another (but this time unsucky, I swear!) module which allows people to implement macros (among other things)).