Matplotlib custom legend

How to add legend to python plot

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 20, 1000)
y1 = np.sin(x)
y2 = np.cos(x)

plt.plot(x, y1, "-b", label="sine")
plt.plot(x, y2, "-r", label="cosine")
plt.legend(loc="upper left")
plt.ylim(-1.5, 2.0)
plt.show()

Source: stackoverflow.com

Matplotlib legend

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 20, 1000)
y1 = np.sin(x)
y2 = np.cos(x)

plt.plot(x, y1, "-b", label="sine")
plt.plot(x, y2, "-r", label="cosine")
plt.legend(loc="upper left")
plt.ylim(-1.5, 2.0)
plt.show()

Source: stackoverflow.com

Matplotlib custom legend

import matplotlib.lines as mlines

eight = mlines.Line2D([], [], color='blue', marker='s', ls='', label='8')
nine = mlines.Line2D([], [], color='blue', marker='D', ls='', label='9')
# etc etc
plt.legend(handles=[eight, nine])

Source: stackoverflow.com

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