src/sage/features/sphinx.py: Add jupyter_sphinx

src/sage/features/sphinx.py

@@ -39,5 +39,33 @@ def __init__(self):
         PythonModule.__init__(self, 'sphinx', spkg='sphinx', type='standard')
 
 
+class JupyterSphinx(PythonModule):
+    r"""
+    A :class:`sage.features.Feature` describing the presence of
+    :ref:`jupyter_sphinx <spkg_jupyter_sphinx>`.
+
+    It is provided by a standard package in the Sage distribution,
+    but it can be disabled by ``configure --disable-doc`` and
+    ``configure --disable-notebook``.
+
+    EXAMPLES::
+
+        sage: from sage.features.sphinx import JupyterSphinx
+        sage: JupyterSphinx().is_present()                      # optional - jupyter_sphinx
+        FeatureTestResult('jupyter_sphinx', True)
+    """
+    def __init__(self):
+        r"""
+        TESTS::
+
+            sage: from sage.features.sphinx import JupyterSphinx
+            sage: isinstance(JupyterSphinx(), JupyterSphinx)
+            True
+        """
+        PythonModule.__init__(self, 'jupyter_sphinx',
+                              spkg='jupyter_sphinx', type='standard')
+
+
 def all_features():
-    return [Sphinx()]
+    return [Sphinx(),
+            JupyterSphinx()]