Avoid plt.xticks/plt.yticks in gallery examples.

In particular, the ticklabels_rotation example is likely the one most
easily found by those looking for how to do this; let's not suggest that
plt.xticks is "the" way to rotate ticklabels.

Also remove the margins() call (which was really only needed with the
old round_numbers autolimits mode) and the subplots_adjust() call (the
ticklabels already fit in, and the modern approach would be to use
constrained_layout anyways).

Author: anntzer

galleries/examples/subplots_axes_and_figures/secondary_axis.py

@@ -154,7 +154,7 @@ def inverse(x):
 
 ax.plot(dates, temperature)
 ax.set_ylabel(r'$T\ [^oC]$')
-plt.xticks(rotation=70)
+ax.xaxis.set_tick_params(rotation=70)
 
 
 def date2yday(x):

galleries/examples/ticks/ticklabels_rotation.py

@@ -5,17 +5,16 @@
 
 Demo of custom tick-labels with user-defined rotation.
 """
+
 import matplotlib.pyplot as plt
 
 x = [1, 2, 3, 4]
 y = [1, 4, 9, 6]
 labels = ['Frogs', 'Hogs', 'Bogs', 'Slogs']
 
-plt.plot(x, y)
+fig, ax = plt.subplots()
+ax.plot(x, y)
 # You can specify a rotation for the tick labels in degrees or with keywords.
-plt.xticks(x, labels, rotation='vertical')
-# Pad margins so that markers don't get clipped by the Axes
-plt.margins(0.2)
-# Tweak spacing to prevent clipping of tick-labels
-plt.subplots_adjust(bottom=0.15)
+ax.set_xticks(x, labels, rotation='vertical')
+
 plt.show()