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slice-copy (FURB145)

Preview (since v0.0.290) · Related issues · View source

Derived from the refurb linter.

Fix is sometimes available.

This rule is unstable and in preview. The --preview flag is required for use.

What it does

Checks for unbounded slice expressions to copy a list.

Why is this bad?

The list.copy method is more readable and consistent with copying other types.

Known problems

This rule is prone to false negatives due to type inference limitations, as it will only detect lists that are instantiated as literals or annotated with a type annotation.

Example

a = [1, 2, 3]
b = a[:]

Use instead:

a = [1, 2, 3]
b = a.copy()

References