Source: flake8-mutable Maintainer: Debian Python Team Uploaders: Edward Betts , Section: python Priority: optional Build-Depends: debhelper-compat (= 13), dh-sequence-python3, python3-all, python3-pytest-runner, python3-setuptools, Build-Depends-Indep: python3-pytest , Standards-Version: 4.7.2 Homepage: https://github.com/ebeweber/flake8-mutable Vcs-Browser: https://salsa.debian.org/python-team/packages/flake8-mutable Vcs-Git: https://salsa.debian.org/python-team/packages/flake8-mutable.git Testsuite: autopkgtest-pkg-pybuild Package: python3-flake8-mutable Architecture: all Depends: ${misc:Depends}, ${python3:Depends}, Description: use flake8 to catch functions with mutable default arguments Python's default arguments are evaluated at definition as opposed to when the function is invoked. This leads to unexpected behavior, as mutations persist between calls. This flake8 extension will warn for this type of mistake.