Python Toolbox input parameter list: how to split name from group name?

Manu

I enabled multiple value input for some parameter in an ArcMap 10.8 Python Toolbox.

In my script, I can easily split the input received from the UI by applying .split(";") since the input values are separated by ";".

However, when the user selects a layer from the drop-down that is located within a group, each such value consists of the group name and the layer name, separated by "\". The problem: "\" is an escape character in Python. I cannot separate the layer name from the group name. I need the layer name, though, because I want to search the .mdx document for that name in order to get the full path to the layer on disc.

Is there some way to solve this?

I tried:

 

 

combined_name.split("\\")
combined_name.split(r"\\")
r"{0}".format(combined_name).split("\\")

 

 

where combined_name is the respective name extracted from the input variable. All these attempts were without success.

 

Edit: I tried the arcpy.GetParameter(0) suggestion with no success. This is the Toolbox I used to test it:

import arcpy as ap
# Toolbox
class Toolbox(object):
    def __init__(self):
        self.label = "Tool"
        self.alias = "Tool"
        # List of tool classes associated with this toolbox
        self.tools = [Tool]
class Tool(object):
    def __init__(self):
        self.label = "Tool"
        self.description = "Test GetParameter(0)."
        self.canRunInBackground = False
    def getParameterInfo(self):
        """Define parameter definitions"""       
        in_raster = ap.Parameter(
            displayName = "Input Raster",
            name = "Raster",
            datatype = ["GPRasterLayer", "DERasterDataset"],
            parameterType = "Required",
            direction = "Input",
            multiValue = True)
        params = [in_raster]
        return params
    def isLicensed(self):
        """Set whether tool is licensed to execute."""
        return True
    def updateParameters(self, params):
        return
    def updateMessages(self, params):
        return
    def execute(self, params, messages):
        rasters = ap.GetParameter(0)
        if rasters is None:
            ap.AddMessage("Parameter is of type None.")
        else:
            ap.AddMessage("Parameter is something other then None.")
        return

When I open the Tool dialogue and add some rasters to the list, I get the "Parameter is oy type None" message after running the tool.

Manu

I found some solution (here, I added a condition to check whether the input is some file path that I don't want to mess up. The tool accepts selecting loaded layers from a drop-down as well as browsing files):

 

def replace_grouped(in_var):
    if not os.path.isfile(in_var):
        out = repr(in_var).strip("'").split("\\")[-1]
    else:
        out = in_var
    return out

 

or, in practice: Since somehow the ending \'" was introduced to some input variables but not others, I had to do the following

 

def replace_grouped(in_var):
    if not os.path.isfile(in_var):
        out = repr(in_var).strip("'").strip('"').strip("'").strip('"') \
            .split("\\")[-1]
    else:
        out = in_var
    return out

 

(very ugly, but I haven't found a better way to get rid of the trailing garbage yet.)