Latest Contributions by DarrenWiens2

The thing that jumps out to me is that you start several cursors, never use one of them, and never delete them. You should use 'with' syntax, which cleans up your cursors even if they error out, and avoid seemingly random errors - which you seem to be experiencing. ... View more

Yes, this is the line that builds the dictionary. It uses some shorthand called a dictionary comprehension: features = {row[0]:[row[1],row[2]] for row in arcpy.da.SearchCursor(index,['ID','SHAPE@','Scale'])} This line is equivalent to: features = {} with arcpy.da.SearchCursor(index,['ID','SHAPE@','Scale']) as cursor:     for row in rows:         features[row[0]] = [row[1],row[2]] # I think this is right, but may get key error, I can't remember And, yes, you're mostly right about which part specifies what in row. The first value ('ID') becomes the first item in row (row[0]), second value ('SHAPE@') goes into row[1], and third value ('Scale') goes into row[2]. If you listed more fields, they would go into row[3], row[4], etc. ... View more

You would need to add the scale value into the features dictionary. Before, the dictionary had the form: {ID1:SHAPE1, ID2:SHAPE2,...}. Below, I've changed it to be like: {ID1:[SHAPE1,SCALE1], ID2:[SHAPE2,SCALE2]...}. So, later on, you can reference by ID (features[pageNum]) and get either the shape ([0]), or scale ([1]). import time    mxd = arcpy.mapping.MapDocument("CURRENT")    df1 = arcpy.mapping.ListDataFrames(mxd,"Layers")[0]    df2 = arcpy.mapping.ListDataFrames(mxd,"Layer02")[0]  fc = "D:\Practice\Arcpy\New_Shapefile.shp"  index = fc # my DDP index layer    features = {row[0]:[row[1],row[2]] for row in arcpy.da.SearchCursor              (index,['ID','SHAPE@','Scale'])} # all index features    for pageNum in range(1,mxd.dataDrivenPages.pageCount,2):        mxd.dataDrivenPages.currentPageID = pageNum        df1.extent = features[pageNum][0].extent      df1.scale = features[pageNum][1]     df2.extent = features[pageNum+1][0].extent      df2.scale = features[pageNum+1][1]     arcpy.RefreshActiveView      print ['ID']      arcpy.mapping.ExportToPDF(mxd, r"D:\Practice\Arcpy\Page_" + str(pageNum) + ".pdf")      time.sleep(2)  del mxd ... View more

It just doesn't actually read the available IDs. It assumes that every ID exists between 1 and the length of the list. If you happened to have IDs 1, 2, 3, 5 (missing 4), when the loop is on 3 it will look for value 4 (pageNum+1), but since it's not there, there will be an error. If all your IDs exist, there should be no problem. ... View more

This seems to work using a modern cursor. This works for 'nice' data, but you may have to do some work if you're missing IDs or something. >>> import time ... mxd = arcpy.mapping.MapDocument("CURRENT") ... df1 = arcpy.mapping.ListDataFrames(mxd,"Layers1")[0] ... df2 = arcpy.mapping.ListDataFrames(mxd,"Layers2")[0] ... index = 'buff' # my DDP index layer ... features = {row[0]:row[1] for row in arcpy.da.SearchCursor(index,['ID','SHAPE@'])} # all index features ... for pageNum in range(1,mxd.dataDrivenPages.pageCount,2): ...    mxd.dataDrivenPages.currentPageID = pageNum ...    df1.extent = features[pageNum].extent ...    df2.extent = features[pageNum+1].extent ...    arcpy.RefreshActiveView ...    time.sleep(2) ... View more

I'll just point out that this type of script can be greatly simplified by using modern arcpy geometry objects: >>> fc = 'lines' # line feature layer ... bearing_field = 'BEARING' # bearing field ... sr = arcpy.Describe(fc).spatialReference # spatial reference of lines ... with arcpy.da.UpdateCursor(fc,['SHAPE@',bearing_field],spatial_reference=sr) as cursor: # create cursor ...    for row in cursor: # loop through lines ...        pt1 = arcpy.PointGeometry(row[0].firstPoint,sr) # first point geometry ...        pt2 = arcpy.PointGeometry(row[0].lastPoint,sr) # last point geometry ...        row[1] = pt1.angleAndDistanceTo(pt2)[0] # (angle, distance)[0] = angle ...        if row[1] < 0: # if you want all positive angles ...            row[1] += 360 ...        cursor.updateRow(row) # write value ... View more

You need to add all of the feature class paths to be merged into a list, which will be the first parameter in the Merge tool. So, something along the lines of (obviously, pseudocode): for ds... # loop datasets     mylist = [] # empty list for each dataset     for fc... # loop feature classes         mylist.append(os.path.join(...)) # add path to list     Merge(mylist,...) # merge list for each dataset ... View more

Forgive me for not wanting to dive back into the tedium of this math, but perhaps you can use something from this thread: Calculating angles using ArcGIS Desktop 10.2 ... View more

Oh, if you're back at 10.0, the arcpy data access module didn't exist. Consult the help for reading and writing geometries at 10.0 with normal cursors. ... View more

Don't spill your margarita in the laptop. ... View more

What the heck... Parser = VB Script Expression: result Codeblock: result = 0 if [FY11] > 0 then result = result + 1 end if if [FY12] > 0 then result = result + 1 end if if [FY13] > 0 then result = result + 1 end if if [FY14] > 0 then result = result + 1 end if if [FY15] > 0 then result = result + 1 end if ... View more

You can also use the field calculator: Parser = Python Expression: blah( !FY11! , !FY12! , !FY13! , !FY14! , !FY15! ) Codeblock: def blah(f1,f2,f3,f4,f5):   params = locals() # dictionary of all arguments in function   my_sum = 0 # cumulative total   for k,v in params.iteritems(): # loop through dictionary     if v>0: # inspect value       my_sum += 1 # add to cumulative total   return my_sum # return total ... View more

You can use an update cursor for this: >>> fc = 'points_test' # feature layer ... fields = ['FY11','FY12','FY13','FY14','FY15','Burns_5Yrs'] # your fields, with burns last ... with arcpy.da.UpdateCursor(fc,fields) as cursor: # create cursor ...     for row in cursor: # loop through features ...         row[-1] = sum(x > 0 for x in row[:-1]) # sum non-zeros, place in last position ...         cursor.updateRow(row) # write new value, after changing burns value ... View more

Do you always have 1 letter followed by X numbers? ... View more

It sounds like you've got lat/long coordinates (degrees) that are being assigned a coordinate reference system measured in some other unit (probably meters). Can you show the coordinate reference system you assign in the Display XY dialog box? It should be plain, old, geographic GCS_WGS_1984 (i.e. not projected). ... View more