Defining parameter data types in a Python toolbox

In a Python toolbox, the parameter's datatype is set using the Parameter class within 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 will arise 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 example below, a parameter is defined that will accept either 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

Caution:

Use of keywords for parameter data types was introduced at 10.1 service pack 1. Parameter descriptions can still be used but are not localized and cannot be used for different locales.

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.
Address Locator Style	GPAddressLocatorStyle	A template on which to base the new address locator.
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 with a mix of feature types with symbology. The dataset is not usable for feature class-based queries or analysis.
Calculator Expression	GPCalculatorExpression	A calculator expression.
Catalog Root	DECatalogRoot	The top-level node in the Catalog tree.
Cell Size	GPSACellSize	The cell size used by 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, and/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.
Disk Connection	DEDiskConnection	An access path to a data storage device.
Double	GPDouble	Any floating-point number will be 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 the data source falls within.
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 (xmin, ymin and xmax, ymax) of a data source. All coordinates for the data source fall within 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; 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 FieldMap.
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 a disk where data is stored.
Formulated Raster	GPRasterFormulated	A raster surface whose cell values are represented by a formula or constant.
Fuzzy function	GPSAFuzzyFunction	Fuzzy function.
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	GPGALayer	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.
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 is designed to store 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 file with a .lyr extension that stores the 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.
MapServer	DEMapServer	A map server.
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 within 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, high_rank_ends, sets the ending value of the first group; the second number, low_rank_begin, 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 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.
Parcel Fabric	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 if pyramids will be built.
Radius	GPSARadius	Specifies which surrounding points will be used for interpolation.
Random Number Generator	GPRandomNumberGenerator	Specifies the seed and the generator to be used 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 if raster statistics will be built.
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, along 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 will be reclassified.
Route Measure Event Properties	GPRouteMeasureEventProperties	Specifies the fields on a table that describe events that are measured by a linear reference route system.
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. It can reside in a personal, file, or ArcSDE geodatabase.
Schematic Diagram	DESchematicDiagram	A schematic diagram.
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 that are used to quantify autocorrelation.
ServerConnection	DEServerConnection	A server connection.
Shapefile	DEShapefile	Spatial data in 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	Data stored in ASCII format.
Tile Size	GPSAGDBEnvTileSize	Specifies the width and the height of a data stored in block.
Time configuration	GPSATimeConfiguration	Specifies the time periods used for calculating solar radiation at specific locations.
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.
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.
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 multiplied each by their given weight and then 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.