Arcpy.mapping
Layer objects are used to control the properties of layers within map document data frames. Turning layer visibility on and off, adding new layers, and adjusting layer order can all be accomplished using Layer object properties.
Creating Layer objects involves passing parameters to the arcpy.mapping.ListLayers()
method. As discussed in Chapter 8, Introduction to ArcPy.Mapping, when referencing an arcpy.mapping.MapDocument
object, the layers within the map document can be accessed using zero-based indexing. This code will print the list of Layer objects contained within the data frame called Layers in an MXD:
import arcpy mxdPath = r'C:\Projects\MXDs\Chapter9\MapDocument1.mxd' mxdObject = arcpy.mapping.MapDocument(mxdPath) dataFrame = arcpy.mapping.ListDataFrames(mxdObject, "Layers")[0] layersList = arcpy.mapping.ListLayers(mxdObject,"",dataFrame) print layersList
The layers within the data frame called Layers, have been assigned...