add a list_annotations() method

doc/source/visualizing/callbacks.rst

@@ -93,7 +93,7 @@ The underlying functions are more thoroughly documented in :ref:`callback-api`.
 .. _annotate-clear:
 
 Clear Callbacks (Some or All)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 .. function:: annotate_clear(index=None)
 
@@ -115,6 +115,27 @@ Clear Callbacks (Some or All)
     p.annotate_clear()
     p.save()
 
+.. _annotate-list:
+
+List Currently Applied Callbacks
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. function:: list_annotations()
+
+   This function will print a list of each of the currently applied
+   callbacks together with their index.  The index can be used with
+   :ref:`annotate_clear() function <annotate-clear>` to remove a
+   specific callback.
+
+.. python-script::
+
+    import yt
+    ds = yt.load("IsolatedGalaxy/galaxy0030/galaxy0030")
+    p = yt.SlicePlot(ds, 'z', 'density', center='c', width=(20, 'kpc'))
+    p.annotate_scale()
+    p.annotate_timestamp()
+    p.list_annotations()
+
 .. _annotate-arrow:
 
 Overplot Arrow

yt/visualization/plot_window.py

@@ -1119,6 +1119,15 @@ def annotate_clear(self, index=None):
         self.setup_callbacks()
         return self
 
+    def list_annotations(self):
+        """
+        List the current callbacks for the plot, along with their index.  This
+        index can be used with annotate_clear to remove a callback from the
+        current plot.
+        """
+        for i, cb in enumerate(self._callbacks):
+            print(i, cb)
+
     def run_callbacks(self):
         for f in self.fields:
             keys = self.frb.keys()