Value

Synthèse

A Value object is returned from GetParameterInfo when used in a script tool's ToolValidator class, and from the GetParameter function depending on the parameter type.

Propriétés

Propriété	Explication	Type de données
isEmpty (Lecture seule)	Indicates whether the value object is empty. Remarque : If a parameter has no value, the parameter's value property will return a NoneType and the isEmpty property will be inaccessible. To determine whether a parameter has a value, use an if check against the Parameter value property, for example, if param.value:.	Boolean
value (Lecture et écriture)	Provides the value of the value object.	String

Exemple de code

Value example

UpdateParameter populates a value list for the second parameter based on the attribute names of NetCDF file.

def updateParameters(self):
    """Modify the values and properties of parameters before internal
    validation is performed.  This method is called whenever a parameter
    has been changed."""

    # If the parameter has been altered, but not validated
    if self.params[0].altered and not self.params[0].hasBeenValidated:
        # Create a NetCDFFIleProperties object based on the input and
        #   use it to populate the value list of the sceond parameter.
        net_cdf = arcpy.NetCDFFileProperties(self.params[0].value.value)
        att_names = net_cdf.getAttributeNames()
        self.params[1].filter.list = att_names
        self.params[1].value = att_names[0]

    return