Latest Contributions by DarrenWiens2

Make sure len(Bld_list) > 0. If the list is empty, there is no item at Bld_list[-1]. ... View more

You can modify Jake Skinner​'s code as below to accommodate DDPs (mostly tested): import arcpy  from arcpy import env  from arcpy import mapping    env.workspace = r"C:\temp\Test.gdb"  extents = []  mxd = mapping.MapDocument(r"C:\temp\python\Philadelphia.mxd")  for pageNum in range(1, mxd.dataDrivenPages.pageCount + 1):      mxd.dataDrivenPages.currentPageID = pageNum      dataframe = mapping.ListDataFrames(mxd, "*")[0]       frameExtent = dataframe.extent       XMAX = frameExtent.XMax       XMIN = frameExtent.XMin       YMAX = frameExtent.YMax       YMIN = frameExtent.YMin       pnt1 = arcpy.Point(XMIN, YMIN)       pnt2 = arcpy.Point(XMIN, YMAX)       pnt3 = arcpy.Point(XMAX, YMAX)       pnt4 = arcpy.Point(XMAX, YMIN)       array = arcpy.Array()       array.add(pnt1)       array.add(pnt2)       array.add(pnt3)       array.add(pnt4)       array.add(pnt1)       polygon = arcpy.Polygon(array)      extents.append(polygon) arcpy.CopyFeatures_management(extents, "Polygon_Extent") ... View more

I agree you don't need Exists. You could check the length of the returned list of feature classes to see if any match. len(wlFclass) ... View more

For what it's worth, running the built-in feature class level tools (Copy, then Append) seems to work about twice as fast as adding fields individually. See below where Test A uses feature class level tools and Test B uses field level tools (I believe these are comparing apples to apples, but I could be wrong). For small feature classes, the differences are pretty small, but for large datasets, the time difference could be considerable. I'd say the code is somewhat simpler, as well. import arcpy, time # Set up shared conditions arcpy.env.workspace = r'C:\junk\new_fields' arcpy.env.overwriteOutput = True template = 'template.shp' # the template FC fcs = arcpy.ListFeatureClasses('*Copy*') # the "other" FCs ############################################# # Test A starttime1 = time.time() outCounter = 1 for fc in fcs:     newCopy = "output_" + str(outCounter) + '.shp'     arcpy.Copy_management(template, newCopy)     arcpy.Append_management(fc, newCopy, 'NO_TEST')     outCounter += 1 endtime1 = time.time() - starttime1 print 'Total time: ' + str(endtime1) +'s' # about 3.5 seconds ############################################ # Test B starttime2 = time.time() fields = arcpy.ListFields(template) allfields = [] for field in fields:     if field.name != 'FID' and field.name != 'Shape':         allfields.append([field.name , field.type , field.precision , field.scale, field.length, field.aliasName , field.isNullable , field.required]) for shape in fcs:     for field in allfields:         arcpy.AddField_management(shape , field[0] , field[1] , field[2], field[3], field[4] , field[5], field[6] , field[7]) endtime2 = time.time() - starttime2 print 'Total time: ' + str(endtime2) +'s' # about 7 seconds ... View more

You could: 1.) Copy your template shapefile 2.) Append the features from one of 20 shapefiles to the copy (Schema type = NO_TEST) ...and repeat. ... View more

Yes, but... - if he's already using the Aggregate tool, he must have ArcInfo - if you're automating the aggregate by attribute, then you may as well carry over the attribute at the same time (using Python) ... View more

Since you mention Aggregating polygons and that Dissolve doesn't work, I assume you've tried the Aggregate tool...? Does it produce the results you're after, and you're looking for a way to automate cycling through each district, or does it not produce the results you want at all? Is this the situation you're describing?: ... View more

There's a link to download the .prj file: http://spatialreference.org/ref/epsg/31277/prj/ If that doesn't work, are you sure you're defining the coordinate system, rather than (incorrectly) trying to reproject the data? ... View more

Are you using data driven pages, perhaps? If so, refresh your data driven pages. Otherwise, it will print at the scale you used to originally create those DDPs. ... View more

Similar to the definition query idea, you can use label classes to turn on/off labels for groups of features. ... View more

# Local variables: Output_Table__2_ = Output_Feature_Class Output_Table = Output_Table__2_ Output_Layer = Output_Table Output_File = Output_Layer ^ this makes 4 copies of Output_Feature_Class. I'm guessing that's not what you're going for. Can you post an error message or more explanation as to what exactly is going wrong? ... View more