Class: QgsExpressionNodeIndexOperator

A indexing expression operator, which allows use of square brackets [] to reference map and array items.

Added in version 3.6.

Class Hierarchy

Base classes

QgsExpressionNode

Abstract base class for all nodes that can appear in an expression.

Methods

container	Returns the container node, representing an array or map value.
evalNode
index	Returns the index node, representing an array element index or map key.
prepareNode

class qgis.core.QgsExpressionNodeIndexOperator

Bases: QgsExpressionNode

__init__(container: QgsExpressionNode | None, index: QgsExpressionNode | None)

Constructor for QgsExpressionNodeIndexOperator.

Parameters:

• container (Optional[QgsExpressionNode])

• index (Optional[QgsExpressionNode])

__init__(a0: QgsExpressionNodeIndexOperator)

Parameters:

a0 (QgsExpressionNodeIndexOperator)

container(self) → QgsExpressionNode | None

Returns the container node, representing an array or map value.

See also

index()

Return type:

Optional[QgsExpressionNode]

evalNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → Any

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

Any

index(self) → QgsExpressionNode | None

Returns the index node, representing an array element index or map key.

See also

container()

Return type:

Optional[QgsExpressionNode]

prepareNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → bool

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

bool