flake8-printf-formatting

flake8 plugin which forbids printf-style string formatting

Installation

pip install flake8-printf-formatting

Codes

Rationale

The official Python 3 documentation doesn't recommend printf-style string formatting:

The formatting operations described here exhibit a variety of quirks that lead to a number of common errors (such as failing to display tuples and dictionaries correctly). Using the newer formatted string literals, the str.format interface, or template strings may help avoid these errors. Each of these alternatives provides their own trade-offs and benefits of simplicity, flexibility, and/or extensibility.

Bad

print("Hello, %s!" % name)

Good

print("Hello, {name}!".format(name=name))

Even better

print(f"Hello, {name}!")

As a pre-commit hook

See pre-commit for instructions

Sample .pre-commit-config.yaml:

-   repo: https://gitlab.com/pycqa/flake8
    rev: 3.7.8
    hooks:
    -   id: flake8
        additional_dependencies: [flake8-printf-formatting]

Release process

1. Bump version in setup.cfg.
2. Add a commit "Release vX.Y.Z".
3. Make sure checks still pass.
4. Draft a new release with a tag name "X.Y.Z" and describe changes which involved in the release.
5. Publish the release.