SCR109: self-assignment

Variable assigned to itself

Code	SCR109
Name	self-assignment
Category	Scripts (SCR)
Default severity	warning
Enabled by default	yes
Fix available	no
ign-lint equivalent	none

What it does

Reports x = x and the matching positions of a, b = a, b.

Not reported in class bodies (x = x there copies a module variable into the class) and when the value is a builtin or an Ignition global (len = len makes a module-level alias).

Why is this bad?

The statement does nothing. Usually another name was meant on one side (self.value = value written as value = value).

Example

def valueChanged(self, previousValue, currentValue, origin, missedEvents):
    currentValue = currentValue

Use instead:

def valueChanged(self, previousValue, currentValue, origin, missedEvents):
    self.custom.current = currentValue

pylint

Corresponds to W0127 self-assigning-variable.

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Generated from the rule metadata by iglint generate-docs; iglint rule SCR109 prints the same page in the terminal. Source: docs/rules/SCR109.md.