How to set axis ticks in multiples of pi in Python Matplotlib?

To set axis ticks in multiples of pi in Python, we take following steps −

Initialize a pi variable, create theta and y data points using numpy.
Plot theta and y using plot() method.
Get or set the current tick locations and labels of the X-axis using xticks() method.
Convenience method to set or retrieve autoscaling margins using margins() method.
To display the figure, use show() method.

Example

import numpy as np
from matplotlib import pyplot as plt
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
pi = np.pi
theta = np.arange(-2 * pi, 2 * pi+pi/2, step=(pi / 2))
y = np.sin(theta)

plt.plot(theta, y)
plt.xticks(theta, ['-2π', '-3π/2', 'π', '-π/2', '0', 'π/2', 'π', '3π/2', '2π'])
plt.margins(x=0)
plt.show()