upstream/ipython Files · IPython/nbconvert/postprocessors/__init__.py

cache kernel_info reply for protocol adaptation...

cache kernel_info reply for protocol adaptation WebSocket connections will not open until kernel_info is retrieved, removing a race condition waiting for the reply to indicate adaptation, which could result in a v5 message being sent to a v4 kernel. The reply is cached, so that it need not be requested on each new connection.

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             __init__.py
        
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             / IPython / nbconvert / postprocessors / __init__.py
          
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      from .base import PostProcessorBase

      # protect against unavailable tornado

      try:

          from .serve import ServePostProcessor

      except ImportError:

          pass

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				from .base import PostProcessorBase

				# protect against unavailable tornado
				try:
				from .serve import ServePostProcessor
				except ImportError:
				pass