do not use special method on data class
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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
