none-comparison (E711)#
Derived from the pycodestyle linter.
Fix is always available.
What it does#
Checks for comparisons to None
which are not using the is
operator.
Why is this bad?#
According to PEP 8, "Comparisons to singletons like None should always be done with
is
or is 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 more
information, see this issue.