How to change the text color of font in legend?

As of matplotlib version 3.3.0, you can now directly use the keyword argument labelcolor in matplotlib.pyplot.legend().

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Example using the same color as the corresponding artist by setting labelcolor='linecolor':

import matplotlib.pyplot as plt
import numpy as np

plt.figure(figsize=(4, 3))
plt.plot(np.arange(10), np.random.rand(10) * 0, '-', label='spam')
plt.plot(np.arange(10), np.random.rand(10) * 1, ':', label='ham')
plt.plot(np.arange(10), np.random.rand(10) * 2, 'o', label='eggs')
plt.legend(labelcolor='linecolor')

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Example changing all text to white by setting labelcolor='w', e.g. for dark backgrounds:

import matplotlib.pyplot as plt
import numpy as np

plt.figure(figsize=(4, 3))
plt.plot(np.arange(10), np.random.rand(10) * 0, '-', label='spam')
plt.plot(np.arange(10), np.random.rand(10) * 1, ':', label='ham')
plt.plot(np.arange(10), np.random.rand(10) * 2, 'o', label='eggs')
plt.legend(facecolor='k', labelcolor='w')

call Legend.get_texts() will get a list of Text object in the legend object:

import pylab as pl
pl.plot(randn(100), label="randn")
l = legend()
for text in l.get_texts():
    text.set_color("red")

You can also do it with setp():

import pylab as plt

leg = plt.legend(framealpha = 0, loc = 'best')
for text in leg.get_texts():
    plt.setp(text, color = 'w')

this method also allows you to set the fontsize and any number of other font properties in one line (listed here: http://matplotlib.org/users/text_props.html)

full example:

import pylab as plt

x = range(100)
y1 = range(100,200)
y2 = range(50,150)

fig = plt.figure(facecolor = 'k')
ax = fig.add_subplot(111, axisbg = 'k')
ax.tick_params(color='w', labelcolor='w')
for spine in ax.spines.values():
    spine.set_edgecolor('w')
ax.plot(x, y1, c = 'w', label = 'y1')
ax.plot(x, y2, c = 'g', label = 'y2')

leg = plt.legend(framealpha = 0, loc = 'best')
for text in leg.get_texts():
    plt.setp(text, color = 'w')

plt.show()

Because plt.setp broadcasts over iterables, you can also modify the text color in one line:

# Show some cool graphs
legend = plt.legend()
plt.setp(legend.get_texts(), color='w')

The last line will apply the colour to all elements in the collection of texts.