Merge pull request matplotlib#27962 from timhoffm/doc-grid

DOC: Document axes_grid1.Grid attributes

lib/matplotlib/axes/_axes.py

@@ -3058,7 +3058,7 @@ def stem(self, *args, linefmt=None, markerfmt=None, basefmt=None, bottom=0,
         bottom : float, default: 0
             The y/x-position of the baseline (depending on *orientation*).
 
-        label : str, default: None
+        label : str, optional
             The label to use for the stems in legends.
 
         data : indexable object, optional
@@ -6831,7 +6831,7 @@ def hist(self, x, bins=None, range=None, density=False, weights=None,
             Color or sequence of colors, one per dataset.  Default (``None``)
             uses the standard line color sequence.
 
-        label : str or None, default: None
+        label : str or list of str, optional
             String, or sequence of strings to match multiple datasets.  Bar
             charts yield multiple patches per dataset, but only the first gets
             the label, so that `~.Axes.legend` will work as expected.

lib/mpl_toolkits/axes_grid1/axes_grid.py

@@ -38,6 +38,26 @@ class Grid:
     displayed with a given aspect ratio; for example, it is difficult to
     display multiple images of a same size with some fixed padding between
     them.  AxesGrid can be used in such case.
+
+    Attributes
+    ----------
+    axes_all : list of Axes
+        A flat list of Axes. Note that you can also access this directly
+        from the grid. The following is equivalent ::
+
+            grid[i] == grid.axes_all[i]
+            len(grid) == len(grid.axes_all)
+
+    axes_column : list of list of Axes
+        A 2D list of Axes where the first index is the column. This results
+        in the usage pattern ``grid.axes_column[col][row]``.
+    axes_row : list of list of Axes
+        A 2D list of Axes where the first index is the row. This results
+        in the usage pattern ``grid.axes_row[row][col]``.
+    axes_llc : Axes
+        The Axes in the lower left corner.
+    ngrids : int
+        Number of Axes in the grid.
     """
 
     _defaultAxesClass = Axes
@@ -93,7 +113,8 @@ def __init__(self, fig,
             - "all": All axes are labelled.
             - "keep": Do not do anything.
 
-        axes_class : subclass of `matplotlib.axes.Axes`, default: None
+        axes_class : subclass of `matplotlib.axes.Axes`, default: `.mpl_axes.Axes`
+            The type of Axes to create.
         aspect : bool, default: False
             Whether the axes aspect ratio follows the aspect ratio of the data
             limits.

lib/mpl_toolkits/mplot3d/axes3d.py

@@ -3610,7 +3610,7 @@ def stem(self, x, y, z, *, linefmt='C0-', markerfmt='C0o', basefmt='C3-',
         bottom : float, default: 0
             The position of the baseline, in *orientation*-coordinates.
 
-        label : str, default: None
+        label : str, optional
             The label to use for the stems in legends.
 
         orientation : {'x', 'y', 'z'}, default: 'z'