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Please see:

http://www.ros.org/wiki/rospy/Overview/Time

for an overview of how you access time in rospy. rospy doesn't provide an explicit 'WallTime' because Python comes with the time module; in C++, WallTime is basically a convenience wrapper around various POSIX and Win32 inconsistencies.

If you wish to convert it to a rospy.Time instance you can use:

t = rospy.Time.from_sec(time.time())