Release v1.27.0

This release adds 2 new checks and adds improved detection and error messages for a few other checks!

Add no-copy-with-merge Check (FURB185)

You don't need to call .copy() on a dict/set when using it in a union since the original dict/set is not modified.

Bad:

d = {"a": 1}

merged = d.copy() | {"b": 2}

Good:

d = {"a": 1}

merged = d | {"b": 2}

Add use-sort Check (FURB186)

Don't use sorted() to sort a list and reassign it to itself, use the faster in-place .sort() method instead.

Bad:

names = ["Bob", "Alice", "Charlie"]

names = sorted(names)

Good:

names = ["Bob", "Alice", "Charlie"]

names.sort()

Color is now disabled when piping output

Previously Refurb would always emit color unless you turned it off. Now it will check if the output is a TTY, and if so, disable the color.

Improve use-chain-from-iterable (FURB179)

FURB179 now detects the following snippets:

functools.reduce(operator.add, rows)
functools.reduce(operator.add, rows, [])
functools.reduce(operator.concat, rows)
functools.reduce(operator.concat, rows, [])

These snippets are slow because they use the add/concat operator. This will create a new list for each iteration instead of doing it in-place.

Improve use-dict-union (FURB173)

FURB173 now detects the following snippets:

_ = dict(**x)
_ = dict(x, **y)
_ = dict(**x, **y)
_ = dict(x, a=1)
_ = dict(**x, a=1, b=2)
_ = dict(**x, **y, a=1, b=2)

These can be re-written using dictionary unions:

_ = {**x}
_ = x | y
_ = x | y
_ = x | {"a": 1}
_ = x | {"a": 1, "b": 2}
_ = x | y | {"a": 1, "b": 2}