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venv/Lib/site-packages/nbconvert/exporters/notebook.py

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+"""NotebookExporter class"""
+
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+from .exporter import Exporter
+import nbformat
+from traitlets import Enum, default
+
+class NotebookExporter(Exporter):
+    """Exports to an IPython notebook.
+
+    This is useful when you want to use nbconvert's preprocessors to operate on
+    a notebook (e.g. to execute it) and then write it back to a notebook file.
+    """
+
+    nbformat_version = Enum(list(nbformat.versions),
+        default_value=nbformat.current_nbformat,
+        help="""The nbformat version to write.
+        Use this to downgrade notebooks.
+        """
+    ).tag(config=True)
+
+    @default('file_extension')
+    def _file_extension_default(self):
+        return '.ipynb'
+
+    output_mimetype = 'application/json'
+    export_from_notebook = "Notebook"
+
+    def from_notebook_node(self, nb, resources=None, **kw):
+        nb_copy, resources = super().from_notebook_node(nb, resources, **kw)
+        if self.nbformat_version != nb_copy.nbformat:
+            resources['output_suffix'] = '.v%i' % self.nbformat_version
+        else:
+            resources['output_suffix'] = '.nbconvert'
+        output = nbformat.writes(nb_copy, version=self.nbformat_version)
+        if not output.endswith("\n"):
+            output = output + "\n"
+        return output, resources