This release adds 3 new checks and some general bug fixes.

Add use-suffix check (FURB172)

Note: This check is disabled by default.

When checking the file extension for a pathlib object don't call endswith() on the name field, directly check against suffix instead.

Bad:

from pathlib import Path

def is_markdown_file(file: Path) -> bool:
    return file.name.endswith(".md")

Good:

from pathlib import Path

def is_markdown_file(file: Path) -> bool:
    return file.suffix == ".md"

Add use-dict-union check (FURB173)

Dicts can be created/combined in many ways, one of which is the ** operator (inside the dict), and another is the | operator (used outside the dict). While they both have valid uses, the | operator allows for more flexibility, including using |= to update an existing dict.

See PEP 584 for more info.

Bad:

def add_defaults(settings: dict[str, str]) -> dict[str, str]:
    return {"color": "1", **settings}

Good:

def add_defaults(settings: dict[str, str]) -> dict[str, str]:
    return {"color": "1"} | settings

Add simplify-token-function check (FURB174)

Depending on how you are using the secrets module there might be a more expressive ways of writing what it is you're trying to write.

Bad:

random_hex = token_bytes().hex()
random_url = token_urlsafe()[:16]

Good:

random_hex = token_hex()
random_url = token_urlsafe(16)

Bugs

• Fix tuple related issue in Mypy 1.4.0 where certain checks would be ignored
• Ensure config file exists and is not a directory
• Disallow empty strings as arguments