How to rotate x-axis labels in Matplotlib

X-axis labels in Matplotlib are horizontal by default. If the labels are long strings, then it might appear crowded or overlap with each other.

A common solution for this is to make the labels vertical or rotated at a certain angle:

import matplotlib.pyplot as pyplot
# Plot the graph ... and then
# Rotate X-axis labels anti-clockwise by 30 degrees
pyplot.xticks(rotation=30)