How to set legend marker size and alpha in Matplotlib?

To set legend marker size and alpha in matplotlib, we can take the following steps −

Steps

Set the figure size and adjust the padding between and around the subplots.
Initialize a variable N to store the number of sample data.
Plot the x and y data points with marker="*".
Place a legend on the figure.
Set the marker size and alpha value of the marker.
To display the figure, use show() method.

Example

import matplotlib.pyplot as plt
import numpy as np

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

N = 10

x = np.random.rand(N)
y = np.random.rand(N)

line, = plt.plot(x, y, marker='*', markersize=20, markeredgecolor='black',
   alpha=0.4, ls='none', label='Random Data')

legend = plt.legend(loc='upper right')
legend.legendHandles[0]._legmarker.set_markersize(15)
legend.legendHandles[0]._legmarker.set_alpha(1)

plt.show()

Output

It will produce the following output −

Rishikesh Kumar Rishi

Updated on 02-Feb-2022 11:21:30

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