Arcpy 将要素类添加到当前工作窗口（内容列表）

 test1
layer=arcpy.mapping.Layer( folder+"\\"+"result.shp")
 mxd = arcpy.mapping.MapDocument("CURRENT")
 df = arcpy.mapping.ListDataFrames(mxd)[0]
 arcpy.mapping.AddLayer(df,layer,"TOP")

test2    
layer_name = "acute angle_lyr"
    arcpy.MakeFeatureLayer_management(out_fc, layer_name,workspace=out_folder)
    out_layer = "{}\\acute angle_lyr.lyr".format(out_folder)
    arcpy.SaveToLayerFile_management(layer_name,out_layer)
    layer=arcpy.mapping.Layer(out_layer)
    mxd = arcpy.mapping.MapDocument("CURRENT")
    df = arcpy.mapping.ListDataFrames(mxd)[0]
    arcpy.mapping.AddLayer(df,layer,"TOP")

test3
def AddLayerToMap(in_fc, lyr_name,lyrFile_saveFolder):
    arcpy.MakeFeatureLayer_management(in_fc, lyr_name,workspace=lyrFile_saveFolder)
    out_layer = "{0}\\{1}.lyr".format(lyrFile_saveFolder,lyr_name)
    arcpy.SaveToLayerFile_management(lyr_name,out_layer)
    layer=arcpy.mapping.Layer(out_layer)
    mxd = arcpy.mapping.MapDocument("CURRENT")
    df = arcpy.mapping.ListDataFrames(mxd)[0]
    arcpy.mapping.AddLayer(df,layer,"TOP")
    del layer,mxd

终：
#in_fc: feature class
#lyr_name
#lyrFile_saveFolder: a folder used to save layer file.
def AddLayerToMap(in_fc, lyr_name,lyrFile_saveFolder):
    mxd = arcpy.mapping.MapDocument("CURRENT")
    df = arcpy.mapping.ListDataFrames(mxd)[0]
    for lyr in arcpy.mapping.ListLayers(mxd,"*",df):
        if lyr.name==lyr_name:
            arcpy.mapping.RemoveLayer(df,lyr)
    try:
        arcpy.MakeFeatureLayer_management(in_fc, lyr_name,workspace=lyrFile_saveFolder)
    # except:
    #     lyr_name=lyr_name+"_"+str(uuid.uuid1())
    #     arcpy.MakeFeatureLayer_management(in_fc, lyr_name,workspace=lyrFile_saveFolder)

    out_layer = "{0}\\{1}.lyr".format(lyrFile_saveFolder,lyr_name)
    if os.path.exists(out_layer):
        os.remove(out_layer)
    arcpy.SaveToLayerFile_management(lyr_name,out_layer)
    arcpy.Delete_management(lyr_name)
    layer=arcpy.mapping.Layer(out_layer)
    arcpy.mapping.AddLayer(df,layer,"TOP")