upstream/ipython Files · IPython/nbformat/v1/nbjson.py

Prevent qtconsole frontend freeze on lots of output....

Prevent qtconsole frontend freeze on lots of output. The output from the kernel is now clipped to last `buffer_size` before displaying and a timer is used to flush the pending output text instead of attempting to display text on every stream output from kernel. The timer interval is adjusted based on actual time taken to append a screenful of text to widget. This throttles the widget repaints and avoids choking the Qt event loop leaving time to handle other Qt events. Test cases: In [1]: for i in xrange(1000000): print i In [2]: range(100000) Without this commit the first input causes the qtconsole frontend to freeze, not responding to `Ctrl+C`.

Brian E. Granger - - Load All Authors

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             nbjson.py
        
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      """Read and write notebooks in JSON format.

      Authors:

      * Brian Granger

      """

      #-----------------------------------------------------------------------------

      #  Copyright (C) 2008-2011  The IPython Development Team

      #

      #  Distributed under the terms of the BSD License.  The full license is in

      #  the file COPYING, distributed as part of this software.

      #-----------------------------------------------------------------------------

      #-----------------------------------------------------------------------------

      # Imports

      #-----------------------------------------------------------------------------

      from base64 import encodestring

      from .rwbase import NotebookReader, NotebookWriter

      from .nbbase import from_dict

      import json

      #-----------------------------------------------------------------------------

      # Code

      #-----------------------------------------------------------------------------

      class JSONReader(NotebookReader):

          def reads(self, s, **kwargs):

              nb = json.loads(s, **kwargs)

              return self.to_notebook(nb, **kwargs)

          def to_notebook(self, d, **kwargs):

              """Convert from a raw JSON dict to a nested NotebookNode structure."""

              return from_dict(d)

      class JSONWriter(NotebookWriter):

          def writes(self, nb, **kwargs):

              kwargs['indent'] = 4

              return json.dumps(nb, **kwargs)

      _reader = JSONReader()

      _writer = JSONWriter()

      reads = _reader.reads

      read = _reader.read

      to_notebook = _reader.to_notebook

      write = _writer.write

      writes = _writer.writes

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				"""Read and write notebooks in JSON format.

				Authors:

				* Brian Granger
				"""

				#-----------------------------------------------------------------------------
				# Copyright (C) 2008-2011 The IPython Development Team
				#
				# Distributed under the terms of the BSD License. The full license is in
				# the file COPYING, distributed as part of this software.
				#-----------------------------------------------------------------------------

				#-----------------------------------------------------------------------------
				# Imports
				#-----------------------------------------------------------------------------

				from base64 import encodestring
				from .rwbase import NotebookReader, NotebookWriter
				from .nbbase import from_dict
				import json

				#-----------------------------------------------------------------------------
				# Code
				#-----------------------------------------------------------------------------

				class JSONReader(NotebookReader):

				def reads(self, s, **kwargs):
				nb = json.loads(s, **kwargs)
				return self.to_notebook(nb, **kwargs)

				def to_notebook(self, d, **kwargs):
				"""Convert from a raw JSON dict to a nested NotebookNode structure."""
				return from_dict(d)


				class JSONWriter(NotebookWriter):

				def writes(self, nb, **kwargs):
				kwargs['indent'] = 4
				return json.dumps(nb, **kwargs)


				_reader = JSONReader()
				_writer = JSONWriter()

				reads = _reader.reads
				read = _reader.read
				to_notebook = _reader.to_notebook
				write = _writer.write
				writes = _writer.writes