E999 syntax error for match statement

[thosil]

ruff throw a syntax error for code like this:

import sys

value: str = sys.argv[1]

match value:
    case "ruff":
        print("Rough?")
    case "awesome":
        print("Of course is it!")
    case _:
        print("what?")

$ ruff ruff_and_match.py
Found 1 error(s).
ruff_and_match.py:5:8: E999 SyntaxError: invalid syntax. Got unexpected token 'value'

versions

• Python 3.10.6
• ruff 0.0.108

config:

[tool.ruff]
line-length = 100
select=["E", "F", "W", "U", "N", "C", "B", "A", "T", "Q", "RUF", "M", "ANN"]
ignore=["F403", "F405", "B008", "A003"]

(and yes ruff is awesome ;-))

[squiddy]

Yeah, ruff is using RustPython which doesn't support match yet.

Also see #282 and #54

There is a note in the README, but it's a bit hidden.

Ruff does not yet support a few Python 3.9 and 3.10 language features, including structural pattern matching and parenthesized context managers.

[thosil]

ok, sorry for the noise 😬

[squiddy]

No worries, just pointing it out. :) I think Charlie is working on alternatives to RustPython that could fix that.

[charliermarsh]

Yeah, sadly those aren't supported yet. Another possibility is rewriting the RustPython parser to support that syntax! (It has to be rewritten anyway, CPython itself moved to a new parser to support those expressions which were "impossible" in the old parser.)

[charliermarsh]

(For clarity: this is still open, but a dupe of #282.)

[charliermarsh]

Fixed as of v0.0.250 which included match statement support.

[eddyg]

Holy cow! 🎉 That's fantastic news, Charlie! Can't wait to replace all my elif chains with match statements now. 😄

[charliermarsh]

🎸 🎸 🎸