old_contents: """IPython kernels and associated utilities"""
  
  # just for friendlier zmq version check
  from . import zmq
  
  from .connect import *
  from .launcher import *
  from .manager import KernelManager
  from .blocking import BlockingKernelClient
  from .multikernelmanager import MultiKernelManager
  
new_contents: """IPython kernels and associated utilities"""
  
  # just for friendlier zmq version check
  from . import zmq
  
  from .connect import *
  from .launcher import *
  from .client import KernelClient
  from .manager import KernelManager
  from .blocking import BlockingKernelClient
  from .multikernelmanager import MultiKernelManager
  
subject: add KernelClient to IPython.kernel namespace