Fix decorators in ipython code blocks in docs

ci/requirements/doc.yml

@@ -11,7 +11,7 @@ dependencies:
   - dask-core>=2.30
   - h5netcdf>=0.7.4
   - ipykernel
-  - ipython
+  - ipython>=8.5.0
   - iris>=2.3
   - jupyter_client
   - matplotlib-base

doc/internals/extending-xarray.rst

@@ -33,7 +33,28 @@ To resolve this issue for more complex cases, xarray has the
 write a custom "geo" accessor implementing a geography specific extension to
 xarray:
 
-.. literalinclude:: ../examples/_code/accessor_example.py
+.. ipython:: python
+
+    @xr.register_dataset_accessor("geo")
+    class GeoAccessor:
+        def __init__(self, xarray_obj):
+            self._obj = xarray_obj
+            self._center = None
+
+        @property
+        def center(self):
+            """Return the geographic center point of this dataset."""
+            if self._center is None:
+                # we can use a cache on our accessor objects, because accessors
+                # themselves are cached on instances that access them.
+                lon = self._obj.latitude
+                lat = self._obj.longitude
+                self._center = (float(lon.mean()), float(lat.mean()))
+            return self._center
+
+        def plot(self):
+            """Plot data on a map."""
+            return "plotting!"
 
 In general, the only restriction on the accessor class is that the ``__init__`` method
 must have a single parameter: the ``Dataset`` or ``DataArray`` object it is supposed
@@ -42,7 +63,7 @@ to work on.
 This achieves the same result as if the ``Dataset`` class had a cached property
 defined that returns an instance of your class:
 
-.. code-block:: python
+.. ipython:: python
 
     class Dataset:
         ...
@@ -73,11 +94,6 @@ reasons:
 
 Back in an interactive IPython session, we can use these properties:
 
-.. ipython:: python
-    :suppress:
-
-    exec(open("examples/_code/accessor_example.py").read())
-
 .. ipython:: python
 
     ds = xr.Dataset({"longitude": np.linspace(0, 10), "latitude": np.linspace(0, 20)})