'rostopic' and other commands fail after upgrade

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I've got an issue after upgrading my machines where I can't run rostopic or other key ros commands.

I foolishly ran 'sudo apt-get update && sudo apt-get upgrade' on both robots and my workstation without checking upgrading didn't break anything, and they're all displaying the same behavior, so I'm certain it's not my config.

Here's what I get when I try and run 'rostopic':

turtlebot@turtleVM:~$ rostopic
Traceback (most recent call last):
  File "/opt/ros/groovy/bin/rostopic", line 34, in <module>
    import rostopic
  File "/opt/ros/groovy/lib/python2.7/dist-packages/rostopic/__init__.py", line 58, in <module>
    import rospy
  File "/opt/ros/groovy/lib/python2.7/dist-packages/rospy/__init__.py", line 49, in <module>
    from .client import spin, myargv, init_node, \
  File "/opt/ros/groovy/lib/python2.7/dist-packages/rospy/client.py", line 59, in <module>
    import rospy.impl.init
  File "/opt/ros/groovy/lib/python2.7/dist-packages/rospy/impl/init.py", line 107, in <module>
    class RosStreamHandler(rosgraph.roslogging.RosStreamHandler):
AttributeError: 'module' object has no attribute 'RosStreamHandler'

My .bashrc doesn't have anything super special in it, here's the end:

source /opt/ros/groovy/setup.bash
. /opt/ros/groovy/stacks/turtlebot/setup_kobuki.sh
export TURTLEBOT_3D_SENSOR=asus_xtion_pro
export ROS_MASTER_URI="http://localhost:11311"
export ROS_MASTER_URI="http://bert:11311"

Some other enviornment variables that might be relevant: ROS_DISTRO is 'groovy' PYTHONPATH is /opt/ros/groovy/lib/python2.7/dist-packages $PYTHON_CODE_BUILD_ROS_PACKAGE_PATH is set to 'from __future__ import print_function import os env_name = 'CMAKE_PREFIX_PATH' paths = [path for path in os.environ[env_name].split(os.pathsep)] if env_name in os.environ and os.environ[env_name] != '' else [] workspaces = [path for path in paths if os.path.exists(os.path.join(path, '.catkin'))] paths = [] for workspace in workspaces: filename = os.path.join(workspace, '.catkin') data = '' with open(filename) as f: data = f.read() if data == '': paths.append(os.path.join(workspace, 'share')) paths.append(os.path.join(workspace, 'stacks')) else: for source_path in data.split(';'): paths.append(source_path) print(os.pathsep.join(paths))'

Don't know where that last one came from, but it looks like it's something quite deliberate.

My default python is 2.7.3, and if I run it and type 'import ros' it finds the package.

Any ideas what to check or how to get my system working again?

Thanks, Gavin