The ROS command line tools seems to work just fine. Why doesn't the python script show all the packages and why doesn't it give me a version number?

test.py

#!/usr/bin/python
import rospkg
ros_root = rospkg.get_ros_root()
print ("ROS root is " , ros_root)
p = rospkg.get_ros_paths()
print("ROS paths ", p)
l = rospkg.RosStack().list()
print ("List of packages is " , l)
v = rospkg.RosStack().get_stack_version('common_msgs')
print ("Version is " , v)

Running it:

$ test.py  
('ROS root is ', '/opt/ros/kinetic/share/ros')  
('ROS paths ', ['/opt/ros/kinetic/share/ros', '/home/cellula/auv/src', '/opt/ros/kinetic/share'])  
('List of packages is ', ['gazebo_ros_pkgs', 'ros_tutorials', 'nodelet_core', 'geometry_tutorials', 'roscpp_core', 'viz', 'ros', 'vision_opencv', 'perception_pcl', 'rqt_common_plugins', 'image_pipeline', 'desktop', 'rqt_robot_plugins', 'ros_base', 'image_common', 'ros_core', 'perception', 'bond_core', 'common_tutorials', 'ros_comm', 'simulators', 'executive_smach', 'common_msgs', 'image_transport_plugins', 'robot_model', 'visualization_tutorials', 'laser_pipeline', 'robot', 'geometry', 'diagnostics', 'desktop_full'])  
('Version is ', None)

rospack list:

actionlib /opt/ros/kinetic/share/actionlib  
actionlib_msgs /opt/ros/kinetic/share/actionlib_msgs  
actionlib_tutorials /opt/ros/kinetic/share/actionlib_tutorials  
advnav_fog /home/cellula/auv/src/advnav_fog  
angles /opt/ros/kinetic/share/angles  
bond /opt/ros/kinetic/share/bond  
bondcpp /opt/ros/kinetic/share/bondcpp  
bondpy /opt/ros/kinetic/share/bondpy  
camera_calibration /opt/ros/kinetic/share/camera_calibration  
camera_calibration_parsers /opt/ros/kinetic/share/camera_calibration_parsers  
camera_info_manager /opt/ros/kinetic/share/camera_info_manager  
catkin /opt/ros/kinetic/share/catkin  
class_loader /opt/ros/kinetic/share/class_loader  
cmake_modules /opt/ros/kinetic/share/cmake_modules  
collada_parser /opt/ros/kinetic/share/collada_parser  
collada_urdf /opt/ros/kinetic/share/collada_urdf  
compressed_depth_image_transport /opt/ros/kinetic/share/compressed_depth_image_transport  
compressed_image_transport /opt/ros/kinetic/share/compressed_image_transport  
control_msgs /opt/ros/kinetic/share/control_msgs  
cpp_common /opt/ros/kinetic/share/cpp_common  
crl_cmn /home/cellula/auv/src/crl_cmn  
crl_comms /home/cellula/auv/src/crl_comms  
crl_distributed_io /home/cellula/auv/src/crl_distributed_io  
crl_logic /home/cellula/auv/src/crl_logic  
crl_motion_controllers /home/cellula/auv/src/crl_motion_controllers  
crl_msgs /home/cellula/auv/src/crl_msgs  
crl_navigation /home/cellula/auv/src/crl_navigation  
crl_wgfd6 /home/cellula/auv/src/crl_wgfd6  
cv_bridge /opt/ros/kinetic/share/cv_bridge  
depth_image_proc /opt/ros/kinetic/share/depth_image_proc  
diagnostic_aggregator /opt/ros/kinetic/share/diagnostic_aggregator  
diagnostic_analysis /opt/ros/kinetic/share/diagnostic_analysis  
diagnostic_common_diagnostics /opt/ros/kinetic/share/diagnostic_common_diagnostics  
diagnostic_msgs /opt/ros/kinetic/share/diagnostic_msgs  
diagnostic_updater /opt/ros/kinetic/share/diagnostic_updater  
diamond_ir104 /home/cellula/auv/src/diamond_ir104  
dynamic_reconfigure /opt/ros/kinetic/share/dynamic_reconfigure  
eigen_conversions /opt/ros/kinetic/share/eigen_conversions  
eigen_stl_containers /opt/ros/kinetic/share/eigen_stl_containers  
filters /opt/ros/kinetic/share/filters  
gazebo_dev /opt/ros/kinetic/share/gazebo_dev  
gazebo_msgs /opt/ros/kinetic/share/gazebo_msgs  
gazebo_plugins /opt/ros/kinetic/share/gazebo_plugins  
gazebo_ros /opt/ros/kinetic/share/gazebo_ros  
gencpp /opt/ros/kinetic/share/gencpp  
geneus /opt/ros/kinetic/share/geneus  
genlisp /opt/ros/kinetic/share/genlisp  
genmsg /opt/ros/kinetic/share/genmsg  
gennodejs /opt/ros/kinetic/share/gennodejs  
genpy /opt/ros/kinetic/share/genpy  
geometric_shapes /opt/ros/kinetic/share/geometric_shapes  
geometry_msgs /opt/ros/kinetic/share/geometry_msgs  
gl_dependency /opt/ros/kinetic/share/gl_dependency  
gnss_receiver /home/cellula/auv/src/gnss_receiver  
gps_common /home/cellula/auv/src/gps_umd/gps_common    
image_geometry /opt/ros/kinetic/share/image_geometry  
image_publisher /opt/ros/kinetic/share/image_publisher  
image_rotate /opt/ros/kinetic/share/image_rotate  
image_transport /opt/ros/kinetic/share/image_transport    
image_view /opt/ros/kinetic/share/image_view    
imagenex_837a /home/cellula/auv/src/imagenex_837a  
imagenex_881 /home/cellula/auv/src/imagenex_881  
ingenia_servodrive /home/cellula/auv/src/ingenia_servodrive  
interactive_marker_tutorials /opt/ros/kinetic/share/interactive_marker_tutorials  
interactive_markers /opt/ros/kinetic/share/interactive_markers  
joint_state_publisher /opt/ros/kinetic/share/joint_state_publisher. 
kdl_conversions /opt/ros/kinetic/share/kdl_conversions  
kdl_parser /opt/ros/kinetic/share/kdl_parser  
laser_assembler /opt/ros/kinetic/share/laser_assembler  
laser_filters /opt/ros/kinetic/share/laser_filters  
laser_geometry /opt/ros/kinetic/share/laser_geometry  
librviz_tutorial /opt/ros/kinetic/share/librviz_tutorial
lua53 /home/cellula/auv/src/lua53  
map_msgs /opt/ros/kinetic/share/map_msgs  
media_export /opt/ros/kinetic/share/media_export  
message_filters /opt/ros/kinetic/share/message_filters  
message_generation /opt/ros/kinetic/share/message_generation  
message_runtime /opt/ros/kinetic/share/message_runtime  
metocean_hecto /home/cellula/auv/src/metocean_hecto  
mk /opt/ros/kinetic/share/mk  
nav_msgs /opt/ros/kinetic/share/nav_msgs  
nodelet /opt/ros/kinetic/share/nodelet  
nodelet_topic_tools /opt/ros/kinetic/share/nodelet_topic_tools  
nodelet_tutorial_math /opt/ros/kinetic/share/nodelet_tutorial_math  
nortek_dvl /home/cellula/auv/src/nortek_dvl  
nvmd_planes /home/cellula/auv/src/nvmd_planes  
oceanworks_vbs /home/cellula/auv/src/oceanworks_vbs  
octomap /opt/ros/kinetic/share/octomap  
octomap_msgs /opt/ros/kinetic/share/octomap_msgs  
octomap_ros /opt/ros/kinetic/share/octomap_ros  
octomap_server /opt/ros/kinetic/share/octomap_server  
ofg_magnetometer /home/cellula/auv/src/ofg_magnetometer  
opencv3 /opt/ros/kinetic/share/opencv3  
orocos_kdl /opt/ros/kinetic/share/orocos_kdl  
pcl_conversions /opt/ros/kinetic/share/pcl_conversions  
pcl_msgs /opt/ros/kinetic/share/pcl_msgs  
pcl_ros /opt/ros/kinetic/share/pcl_ros  
pluginlib /opt/ros/kinetic/share/pluginlib  
pluginlib_tutorials /opt/ros/kinetic/share/pluginlib_tutorials  
polled_camera /opt/ros/kinetic/share/polled_camera. 
python_orocos_kdl /opt/ros/kinetic/share/python_orocos_kdl  
python_qt_binding /opt/ros/kinetic/share/python_qt_binding  
qt_dotgraph /opt/ros/kinetic/share/qt_dotgraph  
qt_gui /opt/ros/kinetic/share/qt_gui  
qt_gui_cpp /opt/ros/kinetic/share/qt_gui_cpp  
qt_gui_py_common /opt/ros/kinetic/share/qt_gui_py_common  
qwt_dependency /opt/ros/kinetic/share/qwt_dependency  
random_numbers /opt/ros/kinetic/share/random_numbers  
resource_retriever /opt/ros/kinetic/share/resource_retriever  
robot_state_publisher /opt/ros/kinetic/share/robot_state_publisher  
robot_upstart /opt/ros/kinetic/share/robot_upstart  
ros_environment /opt/ros/kinetic/share/ros_environment  
rosbag /opt/ros/kinetic/share/rosbag  
rosbag_migration_rule /opt/ros/kinetic/share/rosbag_migration_rule  
rosbag_storage /opt/ros/kinetic/share/rosbag_storage  
rosbash /opt/ros/kinetic/share/rosbash  
rosboost_cfg /opt/ros/kinetic/share/rosboost_cfg  
rosbuild /opt/ros/kinetic/share/rosbuild  
rosclean /opt/ros/kinetic/share/rosclean  
rosconsole /opt/ros/kinetic/share/rosconsole  
rosconsole_bridge /opt/ros/kinetic/share/rosconsole_bridge  
roscpp /home/cellula/auv/src/ros_comm/clients/roscpp  
roscpp_serialization /opt/ros/kinetic/share/roscpp_serialization  
roscpp_traits /opt/ros/kinetic/share/roscpp_traits  
roscpp_tutorials /opt/ros/kinetic/share/roscpp_tutorials  
roscreate /opt/ros/kinetic/share/roscreate  
rosgraph /opt/ros/kinetic/share/rosgraph  
rosgraph_msgs /opt/ros/kinetic/share/rosgraph_msgs  
roslang /opt/ros/kinetic/share/roslang  
roslaunch /opt/ros/kinetic/share/roslaunch  
roslib /opt/ros/kinetic/share/roslib  
roslint /opt/ros/kinetic/share/roslint  
roslisp /opt/ros/kinetic/share/roslisp  
roslz4 /opt/ros/kinetic/share/roslz4  
rosmake /opt/ros/kinetic/share/rosmake  
rosmaster /opt/ros/kinetic/share/rosmaster  
rosmsg /opt/ros/kinetic/share/rosmsg  
rosnode /opt/ros/kinetic/share/rosnode  
rosout /opt/ros/kinetic/share/rosout  
rospack /opt/ros/kinetic/share/rospack  
rosparam /opt/ros/kinetic/share/rosparam  
rospy /opt/ros/kinetic/share/rospy  
rospy_tutorials /opt/ros/kinetic/share/rospy_tutorials  
rosservice /opt/ros/kinetic/share/rosservice  
rostest /opt/ros/kinetic/share/rostest  
rostime /opt/ros/kinetic/share/rostime  
rostopic /opt/ros/kinetic/share/rostopic  
rosunit /opt/ros/kinetic/share/rosunit  
roswtf /opt/ros/kinetic/share/roswtf  
rqt_action /opt/ros/kinetic/share/rqt_action  
rqt_bag /opt/ros/kinetic/share/rqt_bag  
rqt_bag_plugins /opt/ros/kinetic/share/rqt_bag_plugins  
rqt_console /opt/ros/kinetic/share/rqt_console  
rqt_dep /opt/ros/kinetic/share/rqt_dep  
rqt_graph /opt/ros/kinetic/share/rqt_graph  
rqt_gui /opt/ros/kinetic/share/rqt_gui  
rqt_gui_cpp /opt/ros/kinetic/share/rqt_gui_cpp  
rqt_gui_py /opt/ros/kinetic/share/rqt_gui_py  
rqt_image_view /opt/ros/kinetic/share/rqt_image_view  
rqt_launch /opt/ros/kinetic/share/rqt_launch  
rqt_logger_level /opt/ros/kinetic/share/rqt_logger_level  
rqt_moveit /opt/ros/kinetic/share/rqt_moveit  
rqt_msg /opt/ros/kinetic/share/rqt_msg  
rqt_nav_view /opt/ros/kinetic/share/rqt_nav_view 
rqt_plot /opt/ros/kinetic/share/rqt_plot  
rqt_pose_view /opt/ros/kinetic/share/rqt_pose_view  
rqt_publisher /opt/ros/kinetic/share/rqt_publisher  
rqt_py_common /opt/ros/kinetic/share/rqt_py_common  
rqt_py_console /opt/ros/kinetic/share/rqt_py_console  
rqt_reconfigure /opt/ros/kinetic/share/rqt_reconfigure  
rqt_robot_dashboard /opt/ros/kinetic/share/rqt_robot_dashboard  
rqt_robot_monitor /opt/ros/kinetic/share/rqt_robot_monitor  
rqt_robot_steering /opt/ros/kinetic/share/rqt_robot_steering  
rqt_runtime_monitor /opt/ros/kinetic/share/rqt_runtime_monitor  
rqt_rviz /opt/ros/kinetic/share/rqt_rviz  
rqt_service_caller /opt/ros/kinetic/share/rqt_service_caller  
rqt_shell /opt/ros/kinetic/share/rqt_shell  
rqt_srv /opt/ros/kinetic/share/rqt_srv  
rqt_tf_tree /opt/ros/kinetic/share/rqt_tf_tree  
rqt_top /opt/ros/kinetic/share/rqt_top  
rqt_topic /opt/ros/kinetic/share/rqt_topic  
rqt_web /opt/ros/kinetic/share/rqt_web  
rviz /opt/ros/kinetic/share/rviz  
rviz_plugin_tutorials /opt/ros/kinetic/share/rviz_plugin_tutorials  
rviz_python_tutorial /opt/ros/kinetic/share/rviz_python_tutorial  
seatrac_x150_usbl /home/cellula/auv/src/seatrac_x150_usbl  
self_test /opt/ros/kinetic/share/self_test  
sema /home/cellula/auv/src/sema  
sensor_msgs /opt/ros/kinetic/share/sensor_msgs  
shape_msgs /opt/ros/kinetic/share/shape_msgs  
smach /opt/ros/kinetic/share/smach  
smach_msgs /opt/ros/kinetic/share/smach_msgs  
smach_ros /opt/ros/kinetic/share/smach_ros  
smclib /opt/ros/kinetic/share/smclib  
solus_lite /home/cellula/auv/src/solus_lite  
sonardyne_avtrak6 /home/cellula/auv/src/sonardyne_avtrak6  
sonardyne_sprintnav /home/cellula/auv/src/sonardyne_sprintnav  
sparkfun_imu /home/cellula/auv/src/sparkfun_imu  
stage /opt/ros/kinetic/share/stage  
stage_ros /opt/ros/kinetic/share/stage_ros  
std_msgs /opt/ros/kinetic/share/std_msgs  
std_srvs /opt/ros/kinetic/share/std_srvs  
stereo_image_proc /opt/ros/kinetic/share/stereo_image_proc  
stereo_msgs /opt/ros/kinetic/share/stereo_msgs  
subctech_bms /home/cellula/auv/src/subctech_bms  
system_monitors /home/cellula/auv/src/system_monitors  
tecnadyne /home/cellula/auv/src/tecnadyne  
tf /opt/ros/kinetic/share/tf  
tf2 /opt/ros/kinetic/share/tf2  
tf2_eigen /opt/ros/kinetic/share/tf2_eigen  
tf2_geometry_msgs /opt/ros/kinetic/share/tf2_geometry_msgs  
tf2_kdl /opt/ros/kinetic/share/tf2_kdl
tf2_msgs /opt/ros/kinetic/share/tf2_msgs
tf2_py /opt/ros/kinetic/share/tf2_py
tf2_ros /opt/ros/kinetic/share/tf2_ros
tf_conversions /opt/ros/kinetic/share/tf_conversions
theora_image_transport /opt/ros/kinetic/share/theora_image_transport  
topic_tools /opt/ros/kinetic/share/topic_tools  
trajectory_msgs /opt/ros/kinetic/share/trajectory_msgs  
turtle_actionlib /opt/ros/kinetic/share/turtle_actionlib  
turtle_tf /opt/ros/kinetic/share/turtle_tf  
turtle_tf2 /opt/ros/kinetic/share/turtle_tf2  
turtlesim /opt/ros/kinetic/share/turtlesim  
urdf /opt/ros/kinetic/share/urdf  
urdf_parser_plugin /opt/ros/kinetic/share/urdf_parser_plugin  
urdf_tutorial /opt/ros/kinetic/share/urdf_tutorial  
urdfdom_py /opt/ros/kinetic/share/urdfdom_py  
valeport_uv_svp /home/cellula/auv/src/valeport_uv_svp  
visualization_marker_tutorials /opt/ros/kinetic/share/visualization_marker_tutorials  
visualization_msgs /opt/ros/kinetic/share/visualization_msgs  
viztools /home/cellula/auv/src/viztools  
volz_da26 /home/cellula/auv/src/volz_da26  
watchdog /home/cellula/auv/src/watchdog  
webkit_dependency /opt/ros/kinetic/share/webkit_dependency  
xacro /opt/ros/kinetic/share/xacro  
xmlrpcpp /opt/ros/kinetic/share/xmlrpcpp

v = rospkg.RosStack().get_stack_version('common_msgs')
print ("Version is " , v)
('Version is ', None)