Implement flynt's "join and concat to f-string" transforms #2102
Description
flynt is a specialized linter for f-string usage.
UP031 and UP032 implement flynt's core features, but the two extra transforms
-tc, --transform-concats Replace string concatenations (defined as + operations involving string literals) with f-strings. Available only if flynt is installed with 3.8+ interpreter. -tj, --transform-joins Replace static joins (where the joiner is a string literal and the joinee is a static- length list) with f-strings. Available only if flynt is installed with 3.8+ interpreter. i.e.
a = "Hello" -msg = a + " World" +msg = f"{a} World" -msg2 = "Finally, " + a + " World" +msg2 = "Finally, {a} World"and
a = "Hello" -msg1 = " ".join([a, " World"]) -msg2 = "".join(["Finally, ", a, " World"]) -msg3 = "x".join(("1", "2", "3")) -msg4 = "x".join({"4", "5", "yee"}) -msg5 = "y".join([1, 2, 3]) # Should be transformed +msg1 = f"{a} World" +msg2 = f"Finally, {a} World" +msg3 = "1x2x3" +msg4 = "4x5xyee" +msg5 = f"{1}y{2}y{3}" # Should be transformed msg6 = a.join(["1", "2", "3"]) # Should not be transformed (not a static joiner) msg7 = "a".join(a) # Should not be transformed (not a static joinee) msg8 = "a".join([a, a, *a]) # Should not be transformed (not a static length)respectively could be implemented in Ruff too. (I'd like to work on them! 😄) Should these be FLY series, or should they be RUF?
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FLY001: consider replacing string concatenation with f-string -
FLY002: consider replacing static string joining with f-string (Implement Flynt static string join transform as FLY002 #4196)
Refs #2097 (relating to f-strings)