arcpy path of ArcGIS mapservice layer throws error

Question

I have a few basemaps published to ArcGIS Server. I have a script that I am running which removes these basemap map services. What I need to do is find the source REST endpoints of these mapservices to further narrow down my script. I have just added as per @Vince suggestion the isServiceLayer as an if statement and tried printing out the serviceProperties but the script throws an error on certain layers

sample UPDATED code...

f = path 
mxd = arcpy.mapping.MapDocument(r'{}'.format(f))
for df in arcpy.mapping.ListDataFrames(mxd):
    for x in arcpy.mapping.ListLayers(mxd,data_frame=df):
        if x.isGroupLayer:
            name = str(x)
            if name.startswith("Basemaps"):
                if x.isServiceLayer:
                    print x.serviceProperties
                    arcpy.mapping.RemoveLayer(df,x)

ERROR

_Basemaps_hcgis
_Basemaps_hcgis\ Region
{u'UserName': u'arcgis', u'Supportsrsa': u'-1', u'ServiceType': u'MapServer', u'Connectionfile': u'C:\\Users\\\\AppData\\Roaming\\ESRI\\Desktop10.3\\ArcCatalog\\arcgis on SERVER (admin).ags', u'Connectionmode': u'1', u'URL': u'http://SERVER', u'Servertype': u'1', u'Restversion': u'10.3', u'Rsaurl': u'http://SERVER', u'Server': u'', u'Adminurl': u'http://SERVER', u'Resturl': u'http://SERVER', u'Soapurl': u'http://SERVER', u'Handshakefinished': u'-1', u'Anonymous': u'0', u'Usedefaultstagingfolder': u'-1', u'Admintokenurl': u'http://SERVER', u'Stagingfolder': u'C:\\Users\\\\AppData\\Local\\Temp\\arc434C\\Staging'}
_Basemaps_hcgis\ Region\>570000
Traceback (most recent call last):
  File "C:\Users\Desktop\blah.py", line 11, in <module>
    print x.serviceProperties
  File "C:\Program Files (x86)\ArcGIS\Desktop10.5\ArcPy\arcpy\arcobjects\_base.py", line 78, in _get
    (attr_name, self.__class__.__name__))
NameError: The attribute 'serviceProperties' is not supported on this instance of Layer.

UPDATE from @Alex suggestions:

my mapserver basemaps are in a group layer named Basemaps and I only want to remove those basemaps... the problem is I am running this script through network drives so some of the old MXDS(before my time) have two group layers called Basemaps group layer, 1 from the old server and 1 from the new one. I DO NOT want to remove the new **Basemaps ** group layer and the only way to accomplish this is to open up each mapservice and check which server it is from... here is a picture of how it is set up

Answer 1

The ArcGIS map services are added to the map document as group layers. This means you need to check whether a layer is both a group layer AND a service layer.

This code will remove all layers that are ArcGIS Server services and the server machine they come from has oldservername in the URL. There are other properties which you can use instead of the Resturl, consult the docs.

mxd = arcpy.mapping.MapDocument('current')
for df in arcpy.mapping.ListDataFrames(mxd):
    for lyr in arcpy.mapping.ListLayers(mxd, data_frame=df):    
        if lyr.isGroupLayer and lyr.isServiceLayer:
            if 'oldservername' in lyr.serviceProperties['Resturl']:
                arcpy.mapping.RemoveLayer(df, lyr)

This code will find all ArcGIS Server based map services and remove them from the map document. I use the current map document for simplicity.