What should I change to run this python script on the specific layers only (not all the layers in the MXD) , or just some layers in a group ?

MAMDOUHZALAKY

 

import arcpy

mxd = arcpy.mapping.MapDocument("CURRENT")

for lyr in arcpy.mapping.ListLayers(mxd):

     if lyr.supports("DEFINITIONQUERY"):

         lyr.definitionQuery = "INSERT_YOUR_DQ_HERE"

JohannesLindner

To insert formatted code:

 

If your definition query is the same for all specified layers:

layer_names = ["Layer A", "Layer B", "Layer E"]

mxd = arcpy.mapping.MapDocument("CURRENT")
for lyr in arcpy.mapping.ListLayers(mxd):
    if lyr.name in layer_names and lyr.supports("DEFINITIONQUERY"):
        lyr.definitionQuery = "INSERT_YOUR_DQ_HERE"

 

 

If you want different queries for the layers:

queries = {
    "Layer A": "Query for Layer A",
    "Layer B": "Query for Layer B",
    "Layer E": "Query for Layer E",
}

mxd = arcpy.mapping.MapDocument("CURRENT")
for lyr in arcpy.mapping.ListLayers(mxd):
    if lyr.name in queries and lyr.supports("DEFINITIONQUERY"):
        lyr.definitionQuery = queries[lyr.name]