I'd like to know how to add multiple feature layers to a map? I tried syntax like the following, but only the last feature was added.
from arcgis.features import FeatureLayer
from arcgis.features import FeatureCollection
my_map4 = my_gis.map('Chicago', 9)
my_map4.basemap = 'osm'
f1 = FeatureLayer('http://xxx.com/arcgis/rest/services/Stage/crew_change_point_service/MapServer/0')
f2 = FeatureLayer('http://xxx.com/arcgis/rest/services/Stage/yard_service/MapServer/0')