AttributeError when importing rospy

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Hello there.

When trying to run a python script that imports and uses rospy, I get the following error.

Traceback (most recent call last):
  File "./client_video.py", line 35, in <module>
    import rospy
  File "/usr/lib/python2.7/dist-packages/rospy/__init__.py", line 47, in <module>
    from std_msgs.msg import Header
  File "/usr/lib/python2.7/dist-packages/std_msgs/msg/__init__.py", line 1, in <module>
    from ._Empty import *
  File "/usr/lib/python2.7/dist-packages/std_msgs/msg/_Empty.py", line 9, in <module>
    class Empty(genpy.Message):
AttributeError: 'module' object has no attribute 'Message'

I used -y when apt-get installing python-rospy so the prerequisites should be installed too.

Any help would be much appreciated.

Using ROS Kinetic and Ubuntu 16.04.