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gazebo/pause_physics is an Empty service (no inputs or output arguments), so doesn't need its own service definition. See this section from the wiki page:

~/pause_physics (std_srvs/Empty)
    Pause physics updates. 

~/unpause_physics (std_srvs/Empty)
    Resume physics updates.

Try this and see if it works:

from std_srvs.srv import Empty

If you need it, gazebo/unpause_physics is also an Empty service.