Parameter data types in a Python toolbox

In a Python toolbox, the parameter's datatype property is set using the Parameter class in the getParameterInfo method.

def getParameterInfo(self):
    #Define parameter definitions

    # First parameter
    param0 = arcpy.Parameter(
        displayName="Input workspace",
        name="in_workspace",
        datatype="DEWorkspace",
        parameterType="Required",
        direction="Input")

Composite data types

Occasionally, the need arises for a parameter to accept multiple data types, often referred to as a composite data type. In a Python toolbox, composite data types are defined by assigning a list of data types to the parameter's datatype property. In the following example, a parameter is defined that accepts a raster dataset or a raster catalog:

def getParameterInfo(self):
    #Define parameter definitions

    # First parameter
    param0 = arcpy.Parameter(
        displayName="Input Raster Dataset",
        name="in_rasterdataset",
        datatype=["DERasterDataset", "DERasterCatalog"],
        parameterType="Required",
        direction="Input")

Data types

Every tool parameter has an associated data type.

Data type	datatype keyword	Description
Address Locator	DEAddressLocator	A dataset used for geocoding that stores the address attributes, associated indexes, and rules that define the process for translating nonspatial descriptions of places to spatial data.
Analysis Cell Size	analysis_cell_size	The cell size used by raster tools.
Any Value	GPType	A data type that accepts any value.
ArcMap Document	DEMapDocument	A file that contains one map, its layout, and its associated layers, tables, charts, and reports.
Areal Unit	GPArealUnit	An areal unit type and value, such as square meter or acre.
Boolean	GPBoolean	A Boolean value.
CAD Drawing Dataset	DECadDrawingDataset	A vector data source mixed with feature types and symbology. The dataset is not usable for feature class-based queries or analysis.
Calculator Expression	GPCalculatorExpression	A calculator expression.
Catalog Layer	GPCatalogLayer	A collection of references to different data types. The data types can be from different locations and are managed and visualized dynamically as layers based on location, time, and other attributes.
Catalog Root	DECatalogRoot	The top-level node in the Catalog tree.
Cell Size	GPSACellSize	The cell size used by the ArcGIS Spatial Analyst extension.
Cell Size XY	GPCellSizeXY	Defines the two sides of a raster cell.
Composite Layer	GPCompositeLayer	A reference to several children layers, including symbology and rendering properties.
Compression	GPSAGDBEnvCompression	Specifies the type of compression used for a raster.
Coordinate System	GPCoordinateSystem	A reference framework, such as the UTM system consisting of a set of points, lines, or surfaces, and a set of rules used to define the positions of points in two- and three-dimensional space.
Coordinate Systems Folder	DESpatialReferencesFolder	A folder on disk storing coordinate systems.
Coverage	DECoverage	A coverage dataset, a proprietary data model for storing geographic features as points, arcs, and polygons with associated feature attribute tables.
Coverage Feature Class	DECoverageFeatureClasses	A coverage feature class, such as point, arc, node, route, route system, section, polygon, and region.
Data Element	DEType	A dataset visible in ArcCatalog.
Data File	GPDataFile	A data file.
Database Connections	DERemoteDatabaseFolder	The database connection folder in ArcCatalog.
Dataset	DEDatasetType	A collection of related data, usually grouped or stored together.
Date	GPDate	A date value.
dBASE Table	DEDbaseTable	Attribute data stored in dBASE format.
Decimate	GP3DADecimate	Specifies a subset of nodes of a TIN to create a generalized version of that TIN.
Diagram Layer	GPDiagramLayer	A diagram layer.
Disk Connection	DEDiskConnection	An access path to a data storage device.
Double	GPDouble	Any floating-point number stored as a double precision, 64-bit value.
Encrypted String	GPEncryptedString	Encrypted string for passwords.
Envelope	GPEnvelope	The coordinate pairs that define the minimum bounding rectangle in which the data source falls.
Evaluation Scale	GPEvaluationScale	The scale value range and increment value applied to inputs in a weighted overlay operation.
Extent	GPExtent	Specifies the coordinate pairs that define the minimum bounding rectangle (x-minimum, y-minimum and x-maximum, y-maximum) of a data source. All coordinates for the data source fall in this boundary.
Extract Values	GPSAExtractValues	An extract values parameter.
Feature Class	DEFeatureClass	A collection of spatial data with the same shape type: point, multipoint, polyline, and polygon.
Feature Dataset	DEFeatureDataset	A collection of feature classes that share a common geographic area and the same spatial reference system.
Feature Layer	GPFeatureLayer	A reference to a feature class, including symbology and rendering properties.
Feature Set	GPFeatureRecordSetLayer	Interactive features that draw the features when the tool is run.
Field	Field	A column in a table that stores the values for a single attribute.
Field Info	GPFieldInfo	The details about a field in a field map.
Field Mappings	GPFieldMapping	A collection of fields in one or more input tables.
File	DEFile	A file on disk.
Folder	DEFolder	Specifies a location on disk where data is stored.
Formulated Raster	GPRasterFormulated	A raster surface whose cell values are represented by a formula or constant.
Fuzzy function	GPSAFuzzyFunction	Specifies the algorithm used in fuzzification of an input raster.
Geodataset	DEGeodatasetType	A collection of data with a common theme in a geodatabase.
GeoDataServer	DEGeoDataServer	A coarse-grained object that references a geodatabase.
Geometric Network	DEGeometricNetwork	A linear network represented by topologically connected edge and junction features. Feature connectivity is based on their geometric coincidence.
Geostatistical Layer	GPGALayer	A reference to a geostatistical data source, including symbology and rendering properties.
Geostatistical Search Neighborhood	GPGASearchNeighborhood	Defines the searching neighborhood parameters for a geostatistical layer.
Geostatistical Value Table	GPGAValueTable	A collection of data sources and fields that define a geostatistical layer.
GlobeServer	DEGlobeServer	A Globe server.
GPServer	DEGPServer	A geoprocessing server.
Graph	GPGraph	A graph.
Graph Data Table	GPGraphDataTable	A graph data table.
Group Layer	GPGroupLayer	A collection of layers that appear and act as a single layer. Group layers make it easier to organize a map, assign advanced drawing order options, and share layers for use in other maps.
Horizontal Factor	GPSAHorizontalFactor	The relationship between the horizontal cost factor and the horizontal relative moving angle.
Image Service	DEImageServer	An image service.
Index	Index	A data structure used to speed the search for records in geographic datasets and databases.
INFO Expression	GPINFOExpression	A syntax for defining and manipulating data in an INFO table.
INFO Item	GPArcInfoItem	An item in an INFO table.
INFO Table	DEArcInfoTable	A table in an INFO database.
Internet Tiled Layer	GPInternetTiledLayer	An internet tiled layer.
KML Layer	GPKMLLayer	A KML layer.
LAS Dataset	DELasDataset	A LAS dataset stores reference to one or more LAS files on disk as well as to additional surface features. A LAS file is a binary file that stores airborne lidar data.
LAS Dataset Layer	GPLasDatasetLayer	A layer that references a LAS dataset on disk. This layer can apply filters on lidar files and surface constraints referenced by a LAS dataset.
Layer	GPLayer	A reference to a data source, such as a shapefile, coverage, geodatabase feature class, or raster, including symbology and rendering properties.
Layer File	DELayer	A layer file stores a layer definition, including symbology and rendering properties.
Line	GPLine	A shape, straight or curved, defined by a connected series of unique x,y-coordinate pairs.
Linear Unit	GPLinearUnit	A linear unit type and value such as meter or feet.
Long	GPLong	An integer number value.
M Domain	GPMDomain	A range of lowest and highest possible value for m-coordinates.
Map	GPMap	An ArcGIS Pro map.
MapServer	DEMapServer	A map server.
Map Server Layer	GPMapServerLayer	A map server layer.
Mosaic Dataset	DEMosaicDataset	A collection of raster and image data that allows you to store, view, and query the data. It is a data model in the geodatabase used to manage a collection of raster datasets (images) stored as a catalog and viewed as a mosaicked image.
Mosaic Layer	GPMosaicLayer	A layer that references a mosaic dataset.
Neighborhood	GPSANeighborhood	The shape of the area around each cell used to calculate statistics.
Network Analyst Class FieldMap	NAClassFieldMap	Mapping between location properties in a Network Analyst layer (such as stops, facilities, and incidents) and a point feature class.
Network Analyst Hierarchy Settings	GPNAHierarchySettings	A hierarchy attribute that divides hierarchy values of a network dataset into three groups using two integers. The first integer sets the ending value of the first group; the second number sets the beginning value of the third group.
Network Analyst Layer	GPNALayer	A special group layer used to express and solve network routing problems. Each sublayer held in memory in a Network Analyst layer represents some aspect of the routing problem and the routing solution.
Network Data Source	GPNetworkDataSource	A network data source can be a local dataset specified either using its catalog path or a layer from a map, or it can be a URL to a portal.
Network Dataset	DENetworkDataset	A collection of topologically connected network elements (edges, junctions, and turns), derived from network sources and associated with a collection of network attributes.
Network Dataset Layer	GPNetworkDatasetLayer	A reference to a network dataset, including symbology and rendering properties.
Network Travel Mode	NetworkTravelMode	A dictionary of travel mode objects.
Parcel Fabric For ArcMap	DECadastralFabric	A parcel fabric is a dataset for the storage, maintenance, and editing of a continuous surface of connected parcels or parcel network.
Parcel Fabric Layer	GPCadastralFabricLayer	A layer referencing a parcel fabric on disk. This layer works as a group layer organizing a set of related layers under a single layer.
Point	GPPoint	A pair of x,y-coordinates.
Polygon	GPPolygon	A connected sequence of x,y-coordinate pairs, where the first and last coordinate pair are the same.
Projection File	DEPrjFile	A file storing coordinate system information for spatial data.
Pyramid	GPSAGDBEnvPyramid	Specifies whether pyramids are built.
Radius	GPSARadius	Specifies which surrounding points are used for interpolation.
Random Number Generator	GPRandomNumberGenerator	Specifies the seed and the generator to use when creating random values.
Raster Band	DERasterBand	A layer in a raster dataset.
Raster Calculator Expression	GPRasterCalculatorExpression	A raster calculator expression.
Raster Catalog	DERasterCatalog	A collection of raster datasets defined in a table. Each table record defines an individual raster dataset in the catalog.
Raster Catalog Layer	GPRasterCatalogLayer	A reference to a raster catalog, including symbology and rendering properties.
Raster Data Layer	GPRasterDataLayer	A raster data layer.
Raster Dataset	DERasterDataset	A single dataset built from one or more rasters.
Raster Layer	GPRasterLayer	A reference to a raster, including symbology and rendering properties.
Raster Statistics	GPSAGDBEnvStatistics	Specifies whether raster statistics build.
Raster Type	GPRasterBuilder	Raster data is added to a mosaic dataset by specifying a raster type. The raster type identifies metadata, such as georeferencing, acquisition date, and sensor type, with a raster format.
Record Set	GPRecordSet	Interactive table; type in the table values when the tool is run.
Relationship Class	DERelationshipClass	The details about the relationship between objects in the geodatabase.
Remap	GPSARemap	A table that defines how raster cell values are reclassified.
Route Measure Event Properties	GPRouteMeasureEventProperties	Specifies the fields on a table that describe events measured by a linear reference route system.
Scene Service Layer	GPSceneServiceLayer	A scene service layer.
Schematic Dataset	DESchematicDataset	A schematic dataset contains a collection of schematic diagram templates and schematic feature classes that share the same application domain, for example, water or electrical.
Schematic Diagram	DESchematicDiagram	A schematic diagram.
Schematic Diagram Class	DESchematicDiagramClass	A schematic diagram class.
Schematic Folder	DESchematicFolder	A schematic folder.
Schematic Layer	GPSchematicLayer	A schematic layer is a composite layer composed of feature layers based on the schematic feature classes associated with the template on which the schematic diagram is based.
SemiVariogram	GPSASemiVariogram	Specifies the distance and direction representing two locations used to quantify autocorrelation.
ServerConnection	DEServerConnection	A server connection.
Shapefile	DEShapeFile	Spatial data in a shapefile format.
Spatial Reference	GPSpatialReference	The coordinate system used to store a spatial dataset, including the spatial domain.
SQL Expression	GPSQLExpression	A syntax for defining and manipulating data from a relational database.
String	GPString	A text value.
String Hidden	GPStringHidden	A string that is masked by * characters. Note: The text is not encrypted when used in scripting.
Table	DETable	Tabular data.
Table View	GPTableView	A representation of tabular data for viewing and editing purposes, stored in memory or on disk.
Terrain Layer	GPTerrainLayer	A reference to a terrain, including symbology and rendering properties. It’s used to draw a terrain.
Text File	DETextfile	A text file.
Tile Size	GPSAGDBEnvTileSize	Specifies the width and the height of data stored in block.
Time configuration	GPSATimeConfiguration	Specifies the time periods used for calculating solar radiation at specific locations.
Time Unit	GPTimeUnit	A time unit type and value such as minutes or hours.
TIN	DETin	A vector data structure that partitions geographic space into contiguous, nonoverlapping triangles. The vertices of each triangle are sample data points with x-, y-, and z-values.
Tin Layer	GPTinLayer	A reference to a TIN, including topological relationships, symbology, and rendering properties.
Tool	DETool	A geoprocessing tool.
Toolbox	DEToolbox	A geoprocessing toolbox.
Topo Features	GPSATopoFeatures	Features that are input to the interpolation.
Topology	DETopology	A topology that defines and enforces data integrity rules for spatial data.
Topology Layer	GPTopologyLayer	A reference to a topology, including symbology and rendering properties.
Transformation Function	GPSATransformationFunction	A Spatial Analyst transformation function.
Trajectory Layer	GPTrajectoryLayer	A layer that references a trajectory dataset.
Utility Network	DEUtilityNetwork	A utility network.
Utility Network Layer	GPUtilityNetworkLayer	A utility network layer.
Value Table	GPValueTable	A collection of columns of values.
Variant	GPVariant	A data value that can contain any basic type: Boolean, date, double, long, and string.
Vector Tile Layer	GPVectorLayer	A vector tile layer.
Vertical Factor	GPSAVerticalFactor	Specifies the relationship between the vertical cost factor and the vertical, relative moving angle.
VPF Coverage	DEVPFCoverage	Spatial data stored in Vector Product Format.
VPF Table	DEVPFTable	Attribute data stored in Vector Product Format.
WCS Coverage	DEWCSCoverage	Web Coverage Service (WCS) is an open specification for sharing raster datasets on the web.
Weighted Overlay Table	GPSAWeightedOverlayTable	A table with data to combine multiple rasters by applying a common measurement scale of values to each raster, weighing each according to its importance.
Weighted Sum	GPSAWeightedSum	Specifies data for overlaying several rasters, each multiplied by their given weight and summed.
WMS Map	DEWMSMap	A WMS map.
Workspace	DEWorkspace	A container such as a geodatabase or folder.
XY Domain	GPXYDomain	A range of lowest and highest possible values for x,y-coordinates.
Z Domain	GPZDomain	A range of lowest and highest possible values for z-coordinates.