What tool does:

Simply creates tbf file from raster extent.

What is the problem:

I ran toolbox in ArcMap 10.5.1 and ArcGIS Pro 2.2.4.

When I run it as standalone script it is working just fine.

I am not new to Python nor Python Toolboxes, but today:

1) I received an error which I never encountered before (error shown below)

2) when I declare rasters = arcpy.ListRasters('tif'), list of rasters is empty.

Error code:

Running script Tool...

Traceback (most recent call last): File "", line 54, in execute File "c:\program files\arcgis\pro\Resources\arcpy\arcpy\geoprocessing_base.py", line 527, in set_ self[env] = val File "c:\program files\arcgis\pro\Resources\arcpy\arcpy\geoprocessing_base.py", line 587, in setitem ret_ = setattr(self._gp, item, value) enter code here

RuntimeError: Object: Error in accessing environment Failed to execute (Tool).

Tool code below:

import arcpy
import os

class Toolbox(object):
    def __init__(self):
        """Define the toolbox (the name of the toolbox is the name of the
        .pyt file)."""
        self.label = "tfb file generator"
        self.alias = ""

        # List of tool classes associated with this toolbox
        self.tools = [Tool]

class Tool(object):
    def __init__(self):
        """Define the tool (tool name is the name of the class)."""
        self.label = "Generating tbf files"
        self.description = ""
        self.canRunInBackground = True

    def getParameterInfo(self):
        """Define parameter definitions"""
        # Pierwszy parametr
        inside = arcpy.Parameter(
            displayName="In workspace",

        p = [inside]
        return p

    def isLicensed(self):
        """Set whether tool is licensed to execute."""
        return True

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

    def updateMessages(self, parameters):
        """Modify the messages created by internal validation for each tool
        parameter.  This method is called after internal validation."""

    def execute(self, parameters, messages):
        """The source code of the tool."""
        arcpy.env.overwriteOutput = True

        arcpy.env.workspace = parameters[0].valueAsText
        output = parameters[0].valueAsText
        rasters = arcpy.ListRasters('*.tif')

        for ras in rasters:

            arcpy.AddMessage('Working on raster nr:  {0} of {1} '.format(i, len(rasters)))
            f = arcpy.Raster(ras).extent

            north = f.YMax
            west = f.XMin
            south = f.YMin
            east = f.XMax

            i+= 1

            with open(os.path.join(output,'{0}.tfb'.format(ras_split)), "w+") as text_file:


Fixed all mistakes - tool fully working.


arcpy.env.workspace = parameters[0] should be arcpy.env.workspace = parameters[0].valueAsText.

You are setting the workspace to a Parameter object, not a string, see Accessing parameters within a Python toolbox

Your rasters = arcpy.ListRasters('tif') will find only rasters called exactly "tif". If you want to find rasters with a .tif file extension, use rasters = arcpy.ListRasters('*.tif')

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