invalid-bool-return-type (PLE0304)

Added in 0.16.0 · Related issues · View source

Derived from the Pylint linter.

What it does

Checks for __bool__ implementations that return a type other than bool.

Why is this bad?

The __bool__ method should return a bool object. Returning a different type may cause unexpected behavior.

Example

class Foo:
    def __bool__(self):
        return 2

Use instead:

class Foo:
    def __bool__(self):
        return True

References

• Python documentation: The __bool__ method