How to make several legend keys to the same entry in Matplotlib?

Matplotlib Python Data Visualization

Python Data Science basics with Numpy, Pandas and Matplotlib

Data Visualization using MatPlotLib & Seaborn

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MatPlotLib with Python

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To make several legend keys to the same entry in Matplotlib, we can take the following steps −

Set the figure size and adjust the padding between and around the subplots.
Plot line1 and line2 using plot() method.
Use legend() method to place a legend over the plot with numpoints=1
To display the figure, use show() method.

Example

import matplotlib.pyplot as plt
from matplotlib.legend_handler import HandlerTuple

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

p1, = plt.plot([1, 2.5, 3], 'r-d')
p2, = plt.plot([3, 2, 1], 'k-o')
l = plt.legend([(p1, p2)], ['Two keys'], numpoints=1, handler_map={tuple: andlerTuple(ndivide=None)})

plt.show()