upstream/ipython Files · IPython/nbconvert/exporters/script.py

Handle kernel messages synchronously...

Handle kernel messages synchronously A problem can happen when two messages come in for different comms, where the second depends on the first (for example, the first might be a message setting the state of a widget, and the second triggering a view creation for the widget). Since comm message queues are independent of each other, the second message could be executed before the first message. This exposes a more fundamental assumption users are likely to have that messages from python are processed synchronously. Thanks to @dmadeka for reporting an error that led to discovering this issue.

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      """Generic script exporter class for any kernel language"""

      # Copyright (c) IPython Development Team.

      # Distributed under the terms of the Modified BSD License.

      from .templateexporter import TemplateExporter

      from IPython.utils.traitlets import Dict

      class ScriptExporter(TemplateExporter):

          _exporters = Dict()

          def _template_file_default(self):

              return 'script'

          def from_notebook_node(self, nb, resources=None, **kw):

              langinfo = nb.metadata.get('language_info', {})

              # delegate to custom exporter, if specified

              exporter_name = langinfo.get('nbconvert_exporter')

              if exporter_name and exporter_name != 'script':

                  self.log.debug("Loading script exporter: %s", exporter_name)

                  from .export import exporter_map

                  if exporter_name not in self._exporters:

                      Exporter = exporter_map[exporter_name]

                      self._exporters[exporter_name] = Exporter(parent=self)

                  exporter = self._exporters[exporter_name]

                  return exporter.from_notebook_node(nb, resources, **kw)

              self.file_extension = langinfo.get('file_extension', '.txt')

              self.output_mimetype = langinfo.get('mimetype', 'text/plain')

              return super(ScriptExporter, self).from_notebook_node(nb, resources, **kw)

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				"""Generic script exporter class for any kernel language"""

				# Copyright (c) IPython Development Team.
				# Distributed under the terms of the Modified BSD License.

				from .templateexporter import TemplateExporter

				from IPython.utils.traitlets import Dict

				class ScriptExporter(TemplateExporter):

				_exporters = Dict()

				def _template_file_default(self):
				return 'script'

				def from_notebook_node(self, nb, resources=None, **kw):
				langinfo = nb.metadata.get('language_info', {})

				# delegate to custom exporter, if specified
				exporter_name = langinfo.get('nbconvert_exporter')
				if exporter_name and exporter_name != 'script':
				self.log.debug("Loading script exporter: %s", exporter_name)
				from .export import exporter_map
				if exporter_name not in self._exporters:
				Exporter = exporter_map[exporter_name]
				self._exporters[exporter_name] = Exporter(parent=self)
				exporter = self._exporters[exporter_name]
				return exporter.from_notebook_node(nb, resources, **kw)

				self.file_extension = langinfo.get('file_extension', '.txt')
				self.output_mimetype = langinfo.get('mimetype', 'text/plain')
				return super(ScriptExporter, self).from_notebook_node(nb, resources, **kw)