Remove the legend border in Matplotlib

In this article, we will learn how to Remove the legend border in Matplotlib. Let’s discuss some concepts :

• A legend is an area describing the elements of the graph. In the matplotlib library, there’s a function called legend() which is used to Place a legend on the axes.

Approach:

1. Import Library (Matplotlib)
2. Import / create data.
3. Plot a chart.
4. Add legend.
5. Remove legend border.

Example: Here is an example with legends.

Python3

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

# create data
x = np.linspace(1, 10, 1000)
y1 = np.sin(x)
y2 = np.cos(x)

# plot graph
plt.plot(x, y1)
plt.plot(x, y2)

# add legend
plt.legend(['Sine wave', 'Cos wave'])
plt.show()

Output:

Method 1: (Using frameon = False)

Python3

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

# create data
x = np.linspace(1, 10, 1000)
y1 = np.sin(x)
y2 = np.cos(x)

# plot graph
plt.plot(x, y1)
plt.plot(x, y2)

# add legend and remove frame
plt.legend(['Sine wave', 'Cos wave'], frameon=False)
plt.show()

Output :

Method 2: (Using legend.get_frame().set_alpha(0))

Python3

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

# create data
x = np.linspace(1, 10, 1000)
y1 = np.sin(x)
y2 = np.cos(x)

# plot graph
plt.plot(x, y1)
plt.plot(x, y2)

# add legend
leg = plt.legend(['Sine wave', 'Cos wave'])

# set opacity equal to zero i.e; transparent
leg.get_frame().set_alpha(0)
plt.show()

Output :