Class: QgsExpressionNodeLiteral

An expression node for literal values.

Note

This is an abstract class, with methods which must be implemented by a subclass.

The following methods must be implemented: QgsExpressionNode.needsGeometry()

Class Hierarchy

Inheritance diagram of qgis.core.QgsExpressionNodeLiteral

Base classes

QgsExpressionNode

Abstract base class for all nodes that can appear in an expression.
class qgis.core.QgsExpressionNodeLiteral[source]

Bases: QgsExpressionNode

__init__(value: Any)

Constructor for QgsExpressionNodeLiteral, with the specified literal value.

Parameters:

value (Any)

__init__(a0: QgsExpressionNodeLiteral)
Parameters:

a0 (QgsExpressionNodeLiteral)

virtual evalNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → Any[source]
Parameters:
Return type:

Any

virtual prepareNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → bool[source]
Parameters:
Return type:

bool

value(self) → Any[source]

The value of the literal.

Return type:

Any

valueAsString(self) → str[source]

Returns a string representation of the node’s literal value.

Added in version 3.20.

Return type:

str