What does parameterdependencies do in Python toolbox?
For a derived output parameter, parameterDependencies is set to the input parameter that will be modified by the tool. For input parameters, parameterDependencies contains the name of other parameters used by the data type.
How are parameters set in a Python toolbox?
Almost all tools have parameters and you set their values on the tool dialog box or within a script. When the tool is executed, the parameter values are sent to your tool’s source code. Your tool reads these values and proceeds with its work.
Is there a way in Python to return a value via an output parameter?
There is no reason to, since Python can return multiple values via a tuple: But you can also pass a mutable parameter, and return values via mutation of the object as well: Yes, this is the way to go about multiple return values in python.
How to define parameters in a toolbox in ArcGIS?
If parameterType is set to Derived, then the parameter direction should be set to Output. The example below defines three parameters for a tool: an input parameter that accepts a feature layer, an input parameter that accepts a new field name, and a derived output parameter based on the first input parameter.
How to set parameter data types in Python?
In a Python toolbox, the parameter’s datatype property is set using the Parameter class in the getParameterInfo method. Occasionally, the need arises for a parameter to accept multiple data types, often referred to as a composite data type.
How are parameters defined in geoprocessing in Python?
Geoprocessing creates filters automatically for parameters of type string, long, double, feature class, file, field, and workspace. Even if you don’t set a filter for the parameter, there is still a filter associated with the parameter—it’s just empty. An empty filter is the same as having no filter.
How do you filter a parameter in Python?
Applying a filter to a parameter allows you to narrow the choices available to the user for a parameter. For example, you can set up a field filter that limits choices to just text fields. Geoprocessing creates filters automatically for parameters of type string, long, double, feature class, file, field, and workspace.
What are the required parameters for a function in Python?
In this definition, parameters p1 and p2 are required. p3 is optional and will acquire the value False if not provided by the caller. p4 is also optional and will acquire the value 5 if not provided. If a function parameter is not required, you can set it equal to None.
How to set the schema of a parameter in Python?
The symbology and schema (attributes and geometry type) can be set for the Feature Set and Record Set control by setting the parameter’s value property to a feature class, table, or layer file ( .lyrx ). Applying a filter to a parameter allows you to narrow the choices available to the user for a parameter.