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I have some ArcMap addin that creates new layer and add it into table of content. I need to set up a symbology for the newly created layer based on the attribute table (three differnet values > three diferent colours). Is it possible to manage symbology that way using Python (arcpy.mapping module)?

This is part of my script, but it's only add labes:

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

layer_divide = arcpy.mapping.ListLayers(mxd, "layer", data_frame)[0]
if layer_divide.supports("LABELCLASSES"):
    for lblclass in layer_divide.labelClasses:
        lblclass.expression = '"{}" + [FID] +  "{}"'.format("<FNT size = '20'>","</FNT>")
        lblclass.showClassLabels = True

layer_divide.showLabels = True
arcpy.RefreshActiveView()

I can't find any help how to specify a symbology. Is it even possible?

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