singledispatch-method (PLE1519)

Derived from the Pylint linter.

Fix is sometimes available.

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

What it does

Checks for methods decorated with @singledispatch.

Why is this bad?

The @singledispatch decorator is intended for use with functions, not methods.

Instead, use the @singledispatchmethod decorator, or migrate the method to a standalone function.

Example

from functools import singledispatch


class Class:
    @singledispatch
    def method(self, arg):
        ...

Use instead:

from functools import singledispatchmethod


class Class:
    @singledispatchmethod
    def method(self, arg):
        ...

Fix safety

This rule's fix is marked as unsafe, as migrating from @singledispatch to @singledispatchmethod may change the behavior of the code.