missing-whitespace-around-arithmetic-operator (E226)
Derived from the pycodestyle linter.
Fix is always available.
This rule is unstable and in preview. The --preview flag is required for use.
What it does
Checks for missing whitespace arithmetic operators.
Why is this bad?
According to PEP 8, there should be one space before and after an arithmetic operator (+, -, /, and *).
Example
Use instead: