class altair.FieldValidPredicate(field=Undefined, valid=Undefined, timeUnit=Undefined, **kwds)

FieldValidPredicate schema wrapper

Mapping(required=[field, valid])


Field to be tested.


If set to true the field’s value has to be valid, meaning both not null and not NaN.

timeUnitanyOf(TimeUnit, TimeUnitParams)

Time unit for the field to be tested.

__init__(field=Undefined, valid=Undefined, timeUnit=Undefined, **kwds)


__init__([field, valid, timeUnit])

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