Add Legend to Figure in Matplotlib

Add Legend to Figure in Matplotlib

Add Legend to Figure in Matplotlib. In this article, we'll take a look at how to add a legend to a Matplotlib plot.


Matplotlib is one of the most widely used data visualization libraries in Python. Typically, when visualizing more than one variable, you'll want to add a legend to the plot, explaining what each variable represents.

In this article, we'll take a look at how to add a legend to a Matplotlib plot.

Creating a Plot

Let's first create a simple plot with two variables:

import matplotlib.pyplot as plt
import numpy as np

fig, ax = plt.subplots()

x = np.arange(0, 10, 0.1)
y = np.sin(x)
z = np.cos(x)

ax.plot(y, color='blue')
ax.plot(z, color='black')

Here, we've plotted a sine function, starting at 0 and ending at 10 with a step of 0.1, as well as a cosine function in the same interval and step. Running this code yields:

sine visualization python

Now, it would be very useful to label these and add a legend so that someone who didn't write this code can more easily discern which is which.

python matplotlib

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