do not use special method on data class

Docs > Plateforme de sécurité Datadog > Code Security > Static Code Analysis (SAST) > SAST Rules > do not use special method on data class

Cette page n'est pas encore disponible en français, sa traduction est en cours.
Si vous avez des questions ou des retours sur notre projet de traduction actuel, n'hésitez pas à nous contacter.

Metadata

ID: python-best-practices/dataclass-special-methods

Language: Python

Severity: Notice

Category: Best Practices

Description

Data classes (annotated with @dataclass) do not use special methods, such as __init__, __gt__, and others.

Non-Compliant Code Examples

@dataclass
class _Leaf(Generic[T]):
    parent: _Leaf
    value: T

    def __init__(self, value: Optional[T] = None):
        self.value = value
        self.parent = self

    def update(self, value: T):
        self.value = value
        return self

    def __lt__(self, other: _Leaf):
        return repr(self) < repr(other)

    def __gt__(self, other: _Leaf):
        return repr(self) > repr(other)

    # __eq__ should not be used
    def __eq__(self, other: _Leaf):
        return repr(self) == repr(other)

    def __repr__(self):
        return self.value

Compliant Code Examples

@dataclass
class _Leaf(Generic[T]):
    parent: _Leaf
    value: T

    def update(self, value: T):
        self.value = value
        return self

    def __repr__(self):
        return self.value