Remaining changes to support Matplotlib 3.10 (#630)

Gallery/Contours/NCL_coneff_11.py

@@ -59,9 +59,8 @@
                     cmap='white')  # Use white cmap to have a white background
 
 # Set the colors for the hatches
-for i, collection in enumerate(p.collections):
-    collection.set_edgecolor(colors[i % len(colors)])
-    collection.set_linewidth(0.)
+p.set_edgecolors(colors)
+p.set_linewidth(0.)
 
 # Set linewidth of hatches
 plt.rcParams['hatch.linewidth'] = 2.5

Gallery/Contours/NCL_hov_3.py

@@ -67,14 +67,7 @@
                 levels=np.arange(-6, 12, 2),
                 colors='black',
                 linestyles="-",
-                linewidths=.2)
-
-# Set 0 level contour line to a thicker linewidth
-# If you try to access the "levels" attribute of cs (cs.levels),
-# the list of levels is: [-6, -4, -2, 0, 2, 4, 6, 8, 10]
-# level 0 is at the 3rd index of that list, so those contour lines
-# can be accessed at cs.collections[3]
-cs.collections[3].set_linewidth(1)
+                linewidths=[.2, .2, .2, 1, .2, .2, .2, .2, .2])
 
 # Label the contour levels -4, 0, and 4
 cl = ax.clabel(cs, fmt='%d', levels=[-4, 0, 4])