ArcPy tool in toolbox crashes ArcGIS Pro

Question

been writing a toolbox to speed up my work and I've run into a strange issue. My start well tool works fine, but my add surveys tool does not and causes ArcGIS Pro 2.1 to crash.

I'll post the code below and a github link to download the toolbox.

[GitHub Link][1][1]: https://github.com/tpubben/wellsitetools

import arcpy

class Toolbox(object):
    def __init__(self):
        """Define the toolbox (the name of the toolbox is the name of the
        .pyt file)."""
        self.label = "WellsiteTools"
        self.alias = "Wellsite Geo Tools"

        # List of tool classes associated with this toolbox
        self.tools = [StartWellTool, AddSurveyTool]


class AddSurveyTool(object):
    def __init__(self):
        """Define the tool (tool name is the name of the class)."""
        self.label = "Add Surveys"
        self.description = ""
        self.canRunInBackground = False

    def getParameterInfo(self):
        """Define parameter definitions"""
        param0 = arcpy.Parameter(
            displayName='Select Well',
            name='wellSelect',
            datatype='DEFeatureClass',
            parameterType='Required',
            direction='Input'
        )

        param1 = arcpy.Parameter(
            displayName='Survey File',
            name='surFile',
            datatype='DETextfile',
            direction='Input',
            parameterType='Optional'
        )

        param2 = arcpy.Parameter(
            displayName='Survey Column Order',
            name='colOrder',
            datatype='GPValueTable',
            parameterType='Optional',
            direction='Input'
        )

        param3 = arcpy.Parameter(
            displayName='Coordinate System',
            name='coordSys',
            datatype='GPSpatialReference',
            parameterType='Required',
            direction='Input'
        )

        params = [param0, param1, param2, param3]
        return params

    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."""
        return

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

    def execute(self, parameters, messages):
        """The source code of the tool."""
        well_file = parameters[0].valueAsText
        sur_file = parameters[1].valueAsText
        col_list = parameters[2].valueAsText.split(';')
        utmdat = parameters[3].valueAsText
        # set variables for each column
        m, t, n, e = int(col_list[0][-1]) - 1, int(col_list[1][-1]) - 1, 
              int(col_list[2][-1]) - 1, int(col_list[3][-1]) - 1
        # create a search cursor to pull the info out of the config file
        inp_rows = arcpy.SearchCursor(well_file, fields='wellName; UWI; 
              KBElev; utmE; utmN; UTMDat')

        for row in inp_rows:
            utmE = row.getValue('utmE')
            utmN = row.getValue('utmN')
            kbElev = row.getValue('KBElev')
            uwi = row.getValue('UWI')


        # after parameters are set
        with open(sur_file, 'r') as sf:
            sl = []
            # read lines in provided survey file and find only the ones with 
            # survey data
            for line in sf:
                line = line.strip().split()
                if len(line) > 0 and line[0][0].isdigit():
                    sl.append(line)

        # create feature class for points
        tpm_points = 'p_' + uwi
        arcpy.CreateFeatureclass_management(parameters[5].valueAsText, 
                tpm_points, 'POINT', has_z='ENABLED', 
                spatial_reference=utmdat)
        arcpy.management.AddFields(tpm_points, [['MD', 'DOUBLE', 'MD', 
                None]])
        arcpy.management.AddFields(tpm_points, [['TVD', 'DOUBLE', 'TVD', 
                None]])
        arcpy.management.AddFields(tpm_points, [['EAST', 'DOUBLE', 'NORTH', 
                None]])
        arcpy.management.AddFields(tpm_points, [['NORTH', 'DOUBLE', 'EAST', 
                None]])

        # continue on with assigning each column to the appropriate value
        fields = ['MD', 'TVD', 'EAST', 'NORTH']
        cursor = arcpy.da.InsertCursor(tpm_points, ['MD', 'TVD', 'EAST', 
                'NORTH', 'SHAPE@Z', 'SHAPE@XY'])
        for item in sl:
            # m, t, n, e were defined from parameter 8
            md, tvd, east, north = float(item[m]), float(item[t]), 
                float(item[e]), float(item[n])
            surveys = [md, utmE + east, utmN + north, kbElev - tvd, (utmE + 
                east, utmN + north)]
            cursor.insertRow(surveys)

        arcpy.PointsToLine_management(tpm_points, 'w_' + uwi)
        # delete temp point feature
        # arcpy.Delete_management(tpm_points)
        # add surveys to map
        return

Answer 1

Although you have developed this for Pro I opened it up in ArcMap. It was throwing syntax errors on the lines that you have split across multiple lines and introduced indentations. With some simple deletion to ensure code is all on one line it worked for me.

One of the offending lines was, see how you have indented it:

m, t, n, e = int(col_list[0][-1]) - 1, int(col_list[1][-1]) - 1, 
              int(col_list[2][-1]) - 1, int(col_list[3][-1]) - 1