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I am trying to automate various tasks in ArcGIS Desktop (using ArcMap generally) with Python, and I keep needing a way to add a shape file to the current map. (And then do stuff to it, but that's another story).

The best I can do so far is to add a layer file to the current map, using the following ("addLayer" is a layer file object):

def AddLayerFromLayerFile(addLayer):
 import arcpy
 mxd = arcpy.mapping.MapDocument("CURRENT")
 df = arcpy.mapping.ListDataFrames(mxd, "Layers")[0]
 arcpy.mapping.AddLayer(df, addLayer, "AUTO_ARRANGE")
 arcpy.RefreshActiveView()
 arcpy.RefreshTOC()
 del mxd, df, addLayer

However, my raw data is always going be shape files, so I need to be able to open them. (Equivantly: convert a shape file to a layer file without opening it, but I'd prefer not to do that).

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2 Answers 2

up vote 12 down vote accepted

So, I wrestled with this exact same problem for quite a while. Here's what I found to work:

import arcpy
from arcpy import env

# get the map document
mxd = arcpy.mapping.MapDocument("CURRENT")

# get the data frame
df = arcpy.mapping.ListDataFrames(mxd,"*")[0]

# create a new layer
newlayer = arcpy.mapping.Layer(path_to_shapefile_or_feature_class)

# add the layer to the map at the bottom of the TOC in data frame 0
arcpy.mapping.AddLayer(df, newlayer,"BOTTOM")

The dataframe (variable df) that this code will put the new layer into is the first dataframe in the map document. Also note that this code adds the data as a new layer at the bottom of the TOC. You can also use a number of other arrangement options such as "AUTO_ARRANGE".

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Perfect! (Note to other newbies who come across this: remember to add "import arcpy" at start) –  Tom W Jul 25 '11 at 13:45
    
Hello all, maybe this is a little off-topic but I got the exact same problem with tables. I got to produce a tableview in a script, to run some other linear referencing modules and I cannot add the table to the TOC. Thanks in advance, Annalisa –  Annalisa Minelli Mar 1 '13 at 10:11
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Make Feature Layer (Data Management) http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000006p000000.htm

I just tried it in the Python window of ArcMap and it adds directly to my map ( I didn't have to get my dataframe and call AddLayer).

arcpy.MakeFeatureLayer_management('r:/temp/a.shp','test') alt text

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That works great in the immediate window... but when I try the same code in a script file and run it, nothing happens! (The code runs without error messages, but nothing appears in the ToC) Also, if I remove the layer from the ToC, then try and run the code in the immediate window again, I get a "file already exists" type error. Where is the "test" layer file saved? –  Tom W Jan 6 '11 at 20:11
    
Did you install SP1? –  Jason Scheirer Jan 6 '11 at 21:22
    
@Tom W: I'm pretty much a noob with python and arcpy. But I don't think a layer file is physically created. If you want a layer file, you have to make it and pass the layer name as a parameter: arcpy.SaveToLayerFile_management('test', 'r:/temp/evilmonkey.lyr', 'ABSOLUTE') If you don't want to save the layer and you just want it gone, arcpy.Delete_management('test'). –  Jay Cummins Jan 6 '11 at 21:55
    
@Tom W: just re-read your comment. Are you trying to add a layer to ArcMap from a separate python shell(not the immediate window)? I didn't think you could do that (but I'm no authority on this...maybe you can). –  Jay Cummins Jan 6 '11 at 22:02
    
@Jay It seems like the file doesn't exist on yoru hard drive, yet exists somewhere, otherwise Arc wouldn't complain it already exists! I'm trying to add a shape from a script run from within ArcMap. (Eventually, the script will do various things with the shape file after its added - it's not just there to open the file!). –  Tom W Jan 7 '11 at 14:07
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