Change Legend background using facecolor in MatplotLib

In this article, we will see how can we can change the background color of a legend in our graph using MatplotLib, Here we will take two different examples to showcase different background colors of a legend in our graph.

Requirements:

pip install matplotlib

Approach:

• Import required module.
• Create data.
• Change the background color of a legend.
• Normally plot the data.
• Display plot.

Implementation:

Example 1:

In this example, we will draw different lines with the help of matplotlib and Use the facecolor argument to plt.legend() to specify the legend background color.

Python3

# importing package
import matplotlib.pyplot as plt
import numpy as np

# create data
X = [1,2,3,4,5]
Y = [3,3,3,3,3]

# plot lines
plt.plot(X, Y, label = "Line-1")
plt.plot(Y, X, label = "Line-2")
plt.plot(X, np.sin(X), label = "Curve-1")
plt.plot(X, np.cos(X), label = "Curve-2")

#Change the background color of a  legend.
plt.legend(facecolor="gray")
plt.title("Line Graph - Geeksforgeeks")

plt.show()

Output:

Example 2:

In this example, we will draw a Vertical line with the help of matplotlib and Use the facecolor argument to plt.legend() to specify the legend background color.

Python3

# importing package
import matplotlib.pyplot as plt

#Create data and plot lines.
plt.plot([0, 1], [0, 2.0], label='Label-1')
plt.plot([1, 2], [0, 2.1], label='Label-2')
plt.plot([2, 3], [0, 2.2], label='Label-3')

#Change the background color of a  legend.
plt.legend(facecolor="pink")
plt.title("Line Graph - Geeksforgeeks")

plt.show()

Output: