astroid.constraint.NoneConstraint

class documentation

class NoneConstraint(Constraint): (source)

Represents an "is None" or "is not None" constraint.

Class Method	`match`	Return a new constraint for node matched from expr, if expr matches the constraint pattern.
Method	`satisfied_by`	Return True if this constraint is satisfied by the given inferred value.
Constant	`CONST_NONE`	Undocumented

Inherited from Constraint:

Method	`__init__`	Undocumented
Instance Variable	`negate`	True if this constraint is negated. E.g., "is not" instead of "is".
Instance Variable	`node`	The node that this constraint applies to.

@classmethod
def match(cls: type[Self], node: _NameNodes, expr: nodes.NodeNG, negate: bool = False) -> Self|None: (source) ¶

overrides astroid.constraint.Constraint.match

Return a new constraint for node matched from expr, if expr matches the constraint pattern. Negate the constraint based on the value of negate.

def satisfied_by(self, inferred: InferenceResult) -> bool: (source) ¶

overrides astroid.constraint.Constraint.satisfied_by

Return True if this constraint is satisfied by the given inferred value.

Undocumented

Value

nodes.Const(None)