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yoda-conditions (SIM300)#

Derived from the flake8-simplify linter.

Fix is sometimes available.

What it does#

Checks for conditions that position a constant on the left-hand side of the comparison operator, rather than the right-hand side.

Why is this bad?#

These conditions (sometimes referred to as "Yoda conditions") are less readable than conditions that place the variable on the left-hand side of the comparison operator.

In some languages, Yoda conditions are used to prevent accidental assignment in conditions (i.e., accidental uses of the = operator, instead of the == operator). However, Python does not allow assignments in conditions unless using the := operator, so Yoda conditions provide no benefit in this regard.


if "Foo" == foo:

Use instead:

if foo == "Foo":