ruff check --fix --unsafe-fixes #1997
Open
+831
−827
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Autofixes are made with
ruff
, a radical superset of flake8.Most of these transformations were documented 23 years ago in the Python style guide PEP8.
%
ruff check --statistics | grep "\[\*\]" | sort -k2
%
ruff check --fix --unsafe-fixes
%
ruff rule E711
none-comparison (E711)
Derived from the pycodestyle linter.
Fix is always available.
What it does
Checks for comparisons to
None
which are not using theis
operator.Why is this bad?
According to PEP 8, "Comparisons to singletons like None should always be done with
is
oris not
, never the equality operators."Example
Use instead:
Fix safety
This rule's fix is marked as unsafe, as it may alter runtime behavior when
used with libraries that override the
==
/__eq__
or!=
/__ne__
operators.In these cases,
is
/is not
may not be equivalent to==
/!=
. For moreinformation, see this issue.