class altair.AggregatedFieldDef(op=Undefined, field=Undefined, **kwds)

AggregatedFieldDef schema wrapper

Mapping(required=[op, as])


The aggregation operation to apply to the fields (e.g., "sum", "average", or "count" ). See the full list of supported aggregation operations for more information.


The data field for which to compute aggregate function. This is required for all aggregation operations except "count".


The output field names to use for each aggregated field.

__init__(op=Undefined, field=Undefined, **kwds)


__init__([op, field])

copy([deep, ignore])

Return a copy of the object

from_dict(dct[, validate, _wrapper_classes])

Construct class from a dictionary representation

from_json(json_string[, validate])

Instantiate the object from a valid JSON string


Resolve references in the context of this object's schema or root schema.

to_dict([validate, ignore, context])

Return a dictionary representation of the object

to_json([validate, ignore, context, indent, ...])

Emit the JSON representation for this object as a string.

validate(instance[, schema])

Validate the instance against the class schema in the context of the rootschema.

validate_property(name, value[, schema])

Validate a property against property schema in the context of the rootschema