arcgis 10.1 - Turning off layers in ArcMap via ArcPy?

I'm working on a script in ArcMap 10.1 that takes a screenshot and I need to know how to extinguish (turn off) a layer in my table of contents.

Answer

The Layer object has a read/write property, visible, that can be used to turn on/off layers.

This is some basic code that should get you started:

#A list of layer names that you want to be turned off.
names = [x,y,z,etc]

mxd = arcpy.mapping.MapDocument("current")
df = arcpy.mapping.ListDataFrames(, mxd, "Layers")[0]
layers = arcpy.mapping.ListLayers(mxd, "*", df)


for layer in layers:
  if layer.name in names:
    layer.visible = False

arcpy.RefreshTOC()
arcpy.RefreshActiveView()