topic Re: Labels in .lyr file in Python Questions

Labels in .lyr file

GlenReid — Wed, 20 Feb 2013 17:34:14 GMT

I'm converting an older GP task made using MB to Python.

In the original, data was saved to disk (.shp) and rendered with a layer file (.lyr). Labels were displayed in the output. I've updated the .lyr file to work with an in_memory layer (longer field names). Here is the code:

import arcpy  arcpy.env.workspace = r"C:\gis-ags\src\gp"  # temporary date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"  # Script arguments #date_range = arcpy.GetParameterAsText(0) if date_range == '#' or not date_range:     date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"  # Local variables accum_table = "in_memory\\accumulation_table" stat_table = "in_memory\\stat_table" db_table = r"C:\gis-ags\src\gp\gisselect_cdo.sde\GIS.DAILYSNOW_GP_DATA"  # Table Select arcpy.TableSelect_analysis(db_table, accum_table, date_range)  # Summary Statistics arcpy.Statistics_analysis(accum_table, stat_table, "NAME FIRST;STATE FIRST;SNOWFALL SUM;LATITUDE FIRST;LONGITUDE FIRST", "COBAN")  # Spatial Reference sr = arcpy.SpatialReference() sr.factoryCode = 4269 sr.create()  # Make XY Event Layer lyr = "accum_xy_layer" arcpy.MakeXYEventLayer_management(stat_table, "FIRST_LONGITUDE", "FIRST_LATITUDE", lyr, sr)  # Symbology symbology_layer = "accumulation.lyr" arcpy.ApplySymbologyFromLayer_management(lyr, symbology_layer)

For some reason, the labels are not getting displayed when I run in the ArcMap Python Window.

Am I missing something?

Thanks,
Glen

Re: Labels in .lyr file

Anonymous User — Sat, 11 Dec 2021 13:16:51 GMT

I think you should just need to add this after you apply the symbology:

lyr.showLabels = True

Re: Labels in .lyr file

GlenReid — Wed, 20 Feb 2013 18:14:17 GMT

Caleb,

Thanks for the reply. I had already tried that with this result

Runtime error
Traceback (most recent call last):
File "<string>", line 47, in <module>
AttributeError: 'str' object has no attribute 'showLabels'

I could try to create a feature class, but thought that shouldn't be necessary.

Thanks,
Glen

Re: Labels in .lyr file

Anonymous User — Sat, 11 Dec 2021 13:16:54 GMT

Caleb,

Thanks for the reply. I had already tried that with this result

Runtime error
Traceback (most recent call last):
File "<string>", line 47, in <module>
AttributeError: 'str' object has no attribute 'showLabels'

I could try to create a feature class, but thought that shouldn't be necessary.

Thanks,
Glen

Ahh, I see the problem here. You will need to create a layer object before you can change the layer's properties. Maybe try something like this:

for lyr in arcpy.mapping.ListLayers('accum_xy_layer')[0]:
    lyr.showLabels = True

Re: Labels in .lyr file

T__WayneWhitley — Wed, 20 Feb 2013 18:24:14 GMT

lyr you have set to text, so that's why you get the error.

You used the lyr string to write your event layer - so you need a handle on the event layer object...

Caleb? Ahhh, I see you posted again - yes, that should do it! ...he's going to need the code snippet to get at the CURRENT mxd object (and dataframe likely) as well. After re-reading his post, looks like Glen may want to 'overwrite' his layer file with the label settings from the temp layer in the map. Better confirm that.

Enjoy,
Wayne

Re: Labels in .lyr file

GlenReid — Sat, 11 Dec 2021 13:16:56 GMT

Thanks for the replies.

I have added the ListLayers code, so it now looks like:

import arcpy

arcpy.env.workspace = r"C:\gis-ags\src\gp"

# temporary
date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"

# Script arguments
#date_range = arcpy.GetParameterAsText(0)
if date_range == '#' or not date_range:
    date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"

# Local variables
accum_table = "in_memory\\accumulation_table"
stat_table = "in_memory\\stat_table"
db_table = r"C:\gis-ags\src\gp\gisselect_cdo.sde\GIS.DAILYSNOW_GP_DATA"

# Table Select
arcpy.TableSelect_analysis(db_table, accum_table, date_range)

# Summary Statistics
arcpy.Statistics_analysis(accum_table, stat_table, "NAME FIRST;STATE FIRST;SNOWFALL SUM;LATITUDE FIRST;LONGITUDE FIRST", "COBAN")

# Spatial Reference
sr = arcpy.SpatialReference()
sr.factoryCode = 4269
sr.create()

# Make XY Event Layer
lyr = "accum_xy_layer"
arcpy.MakeXYEventLayer_management(stat_table, "FIRST_LONGITUDE", "FIRST_LATITUDE", lyr, sr)

# Symbology
symbology_layer = "accumulation.lyr"
arcpy.ApplySymbologyFromLayer_management(lyr, symbology_layer)

for lyr in arcpy.mapping.ListLayers('accum_xy_layer')[0]:
    lyr.showLabels = True

I still get a runtime error.

Runtime error
Traceback (most recent call last):
File "<string>", line 47, in <module>
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\utils.py", line 181, in fn_
    return fn(*args, **kw)
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\mapping.py", line 1500, in ListLayers
    result = mixins.MapDocumentMixin(map_document_or_layer).listLayers(wildcard, data_frame)
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\arcobjects\mixins.py", line 823, in listLayers
    layers = self.layers
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\arcobjects\mixins.py", line 683, in layers
    for frame in reversed(self.dataFrames):
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\arcobjects\mixins.py", line 695, in dataFrames
    return map(convertArcObjectToPythonObject, self.pageLayout.dataFrames)
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\arcobjects\mixins.py", line 679, in pageLayout
    return convertArcObjectToPythonObject(self._mxd._arc_object.pageLayout)
AttributeError: 'str' object has no attribute '_arc_object'

I thought that since I previously specified labeling and saved to a .lyr file, that this would be taken care of in the ApplySymbologyFromLayer.

Glen

Re: Labels in .lyr file

Anonymous User — Wed, 20 Feb 2013 19:32:31 GMT

Sorry, I did not look at the full code. My example was for if you were accessing an mxd. So are you just wanting to save this "accum_xy_layer" as a layer file? It would be nice if the apply symbology worked for labels too. I haven't been able to find anything that shows how to copy the label properties from another layer file. There is a way to read label classes but I believe that is only for layers inside an mxd. Hopefully someone else knows how to do this?

Re: Labels in .lyr file

T__WayneWhitley — Sat, 11 Dec 2021 13:16:59 GMT

Yeah, forget please what I said earlier about writing back to lyr file...

Evidently the same problem or 'disconnect' exists, meaning you do not have a handle to the layer...

The layer is in the map, I mean your event layer has been added?

If so try adding this (and I included Caleb's part of it) - I think that will correctly make the association through your currently operating mxd, correct me if I'm wrong please Caleb (I'm not sure):

# Symbology
symbology_layer = "accumulation.lyr"
arcpy.ApplySymbologyFromLayer_management(lyr, symbology_layer)

mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd, "")[0]

for lyr in arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df)[0]:
    lyr.showLabels = True

You may have to refresh the map yourself...

Sorry, forgot that.

Enjoy,
Wayne

Re: Labels in .lyr file

GlenReid — Wed, 20 Feb 2013 20:46:06 GMT

The event layer does get added to the mxd, but only because my GP options are set so.

I added the code and get this error:

Runtime error
Traceback (most recent call last):
File "<string>", line 50, in <module>
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\arcobjects\mixins.py", line 361, in __iter__
self.layers
AttributeError: LayerObject: Get attribute layers does not exist

Re: Labels in .lyr file

T__WayneWhitley — Wed, 20 Feb 2013 21:32:43 GMT

I can no longer be certain what line 50 refers to - post your entire code again. (you should no longer have a line 50)

Is your lyr file where you have set your workspace?

I am posting the full code I think you should have by now:

import arcpy  arcpy.env.workspace = r"C:\gis-ags\src\gp"  # temporary date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"  # Script arguments #date_range = arcpy.GetParameterAsText(0) if date_range == '#' or not date_range:     date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"  # Local variables accum_table = "in_memory\\accumulation_table" stat_table = "in_memory\\stat_table" db_table = r"C:\gis-ags\src\gp\gisselect_cdo.sde\GIS.DAILYSNOW_GP_DATA"  # Table Select arcpy.TableSelect_analysis(db_table, accum_table, date_range)  # Summary Statistics arcpy.Statistics_analysis(accum_table, stat_table, "NAME FIRST;STATE FIRST;SNOWFALL SUM;LATITUDE FIRST;LONGITUDE FIRST", "COBAN")  # Spatial Reference sr = arcpy.SpatialReference() sr.factoryCode = 4269 sr.create()  # Make XY Event Layer lyr = "accum_xy_layer" arcpy.MakeXYEventLayer_management(stat_table, "FIRST_LONGITUDE", "FIRST_LATITUDE", lyr, sr)  # Symbology symbology_layer = "accumulation.lyr"  mxd = arcpy.mapping.MapDocument("CURRENT") df = arcpy.mapping.ListDataFrames(mxd, "")[0]  lyr = arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df)[0] arcpy.ApplySymbologyFromLayer_management(lyr, symbology_layer) lyr.showLabels = True  arcpy.RefreshActiveView()

EDIT: It could be you cannot use ApplySymbologyFromLayer to update labeling - this may be more about what you want, using labelClasses, as posted here by Craig McDade:

http://forums.arcgis.com/threads/78032-Attempting-to-use-showLabels-script-within-a-model...#3

-Wayne

Re: Labels in .lyr file

GlenReid — Sat, 11 Dec 2021 13:17:02 GMT

Yes, the accumulation.lyr file is in the workspace. The code:

import arcpy

arcpy.env.workspace = r"C:\gis-ags\src\gp"

# temporary
date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"

# Script arguments
#date_range = arcpy.GetParameterAsText(0)
if date_range == '#' or not date_range:
    date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"

# Local variables
accum_table = "in_memory\\accumulation_table"
stat_table = "in_memory\\stat_table"
db_table = r"C:\gis-ags\src\gp\gisselect_cdo.sde\GIS.DAILYSNOW_GP_DATA"

# Table Select
arcpy.TableSelect_analysis(db_table, accum_table, date_range)

# Summary Statistics
arcpy.Statistics_analysis(accum_table, stat_table, "NAME FIRST;STATE FIRST;SNOWFALL SUM;LATITUDE FIRST;LONGITUDE FIRST", "COBAN")

# Spatial Reference
sr = arcpy.SpatialReference()
sr.factoryCode = 4269
sr.create()

# Make XY Event Layer
lyr = "accum_xy_layer"
arcpy.MakeXYEventLayer_management(stat_table, "FIRST_LONGITUDE", "FIRST_LATITUDE", lyr, sr)

# Symbology
symbology_layer = "accumulation.lyr"
arcpy.ApplySymbologyFromLayer_management(lyr, symbology_layer)

mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd, "")[0]

for lyr in arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df)[0]:
    lyr.showLabels = True

arcpy.RefreshActiveView()

The error:

Runtime error
Traceback (most recent call last):
File "<string>", line 50, in <module>
File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\arcobjects\mixins.py", line 361, in __iter__
self.layers
AttributeError: LayerObject: Get attribute layers does not exist

I'll take a look at the referenced thread.

Thanks,
Glen

Re: Labels in .lyr file

GlenReid — Sat, 11 Dec 2021 13:17:05 GMT

The line that was throwing the error:

for lyr in arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df)[0]:

Not sure why this is, I'll look into it.

Using Craig's code from the referenced thread fixed the error and displayed the labels:

import arcpy

arcpy.env.workspace = r"C:\gis-ags\src\gp"

# temporary
date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"

# Script arguments
#date_range = arcpy.GetParameterAsText(0)
if date_range == '#' or not date_range:
    date_range = "\"OBDATE\" BETWEEN date '2008-01-01' AND date '2008-01-03'"

# Local variables
accum_table = "in_memory\\accumulation_table"
stat_table = "in_memory\\stat_table"
db_table = r"C:\gis-ags\src\gp\gisselect_cdo.sde\GIS.DAILYSNOW_GP_DATA"

# Table Select
arcpy.TableSelect_analysis(db_table, accum_table, date_range)

# Summary Statistics
arcpy.Statistics_analysis(accum_table, stat_table, "NAME FIRST;STATE FIRST;SNOWFALL SUM;LATITUDE FIRST;LONGITUDE FIRST", "COBAN")

# Spatial Reference
sr = arcpy.SpatialReference()
sr.factoryCode = 4269
sr.create()

# Make XY Event Layer
lyr = "accum_xy_layer"
arcpy.MakeXYEventLayer_management(stat_table, "FIRST_LONGITUDE", "FIRST_LATITUDE", lyr, sr)

# Symbology
symbology_layer = "accumulation.lyr"
arcpy.ApplySymbologyFromLayer_management(lyr, symbology_layer)

mxd = arcpy.mapping.MapDocument("CURRENT")
lyr = arcpy.mapping.ListLayers(mxd, "")[0]

if lyr.supports("LABELCLASSES"):
    for lblclass in lyr.labelClasses:
        lblclass.showClassLabels = True
    lblclass.expression = "[SUM_SNOWFALL]"
    lyr.showLabels = True
    arcpy.RefreshActiveView()

Thanks for all the help!

Glen

Re: Labels in .lyr file

LucasDanzinger — Sat, 11 Dec 2021 13:17:07 GMT

The line that was throwing the error:
for lyr in arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df)[0]:
Not sure why this is, I'll look into it.

Glen,

I'm guessing that this probably doesn't work because you have two different things going on. When you select an item in the list by using the index [0], you are grabbing that one item out of the list. So what your code is saying is that you want to loop through the list, but also only grab index [0] in the list. Instead, I would do either one of the following:

for lyr in arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df):

lyr = arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df)[0]:

Re: Labels in .lyr file

GlenReid — Sat, 11 Dec 2021 13:17:10 GMT

Lucus,

This does work, getting the layer and turning the default labels on:

for lyr in arcpy.mapping.ListLayers(mxd, 'accum_xy_layer', df):
    lyr.showLabels = True

arcpy.RefreshActiveView()

Thanks for the hint.

Glen