How to fill color below a curve in Matplotlib?

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To fill color below a curve, we can take the following steps −

Steps

Initialize variable n. Initialize x and y data points using numpy.
Create a figure and a set of subplots, fig and ax.
Plot the curve using plot() method.
Use fill_between() method to fill the area between the two curves, with -1 value.
To display the figure, use show() method.

Example

import numpy as np
import matplotlib.pyplot as plt
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
n = 256
X = np.linspace(-np.pi, np.pi, n, endpoint=True)
Y = np.sin(2 * X)
fig, ax = plt.subplots()
ax.plot(X, Y, color='blue', alpha=1.00)
ax.fill_between(X, Y, 0, color='blue', alpha=.1)
plt.show()