--refactor runs into an error with some f-string syntax like f"{var=}"

[TheSkeward]

I have a line of code in my project that looks like:

logging.info(f"{OMEGA.message_cache=}, {len(OMEGA.user_cache)=}, "
                 f"{OMEGA.message_cache / max(len(OMEGA.user_cache), 1)=}")

shed works fine but when using shed --refactor it stalls here:

Internal error formatting 'main.py': ParserSyntaxError: Syntax Error @ 794:31.
Incomplete input. Encountered '=', but expected '!', ':', or '}'.

        f"{OMEGA.message_cache=}, {len(OMEGA.user_cache)=}, "
                              ^
    Please report this to https://github.com/Zac-HD/shed/issues

[Zac-HD]

Hmm, looks like failed version detection. Does passing --py38-plus fix it, as a quick workaround?

[TheSkeward]

yep, works fine with shed --refactor --py38-plus

[Zac-HD]

Yep, the underlying problem is that Black doesn't detect f-strings with = as requiring Python 3.8.

I've just released shed 0.9.2 with a workaround, 5724e7f. Thanks for the report, and happy formatting!