图例从左到右填充在列中。换句话说，如果您诱使它认为还有另一行（图例中没有任何文本或线条颜色），则可以填充“图3”下的空间。
import numpy as npimport matplotlib.pyplot as pltfrom pylab import *X = np.linspace(0,100,11)plt.plot(X,-X, label='plot 1', color='red')plt.plot(X,-2*X, label='plot 2', color='green')plt.plot(X,-3*X, label='plot 3', color='blue')line1 = Line2D(range(10), range(10), marker='', color="red")line2 = Line2D(range(10), range(10), marker='',color="green")line3 = Line2D(range(10), range(10), marker='', color="blue")line4 = Line2D(range(10), range(10), marker='', color="white")plt.legend((line1,line4, line3,line2),('plot1','','plot3','plot2'),numpoints=1, loc=4,ncol=2)plt.show()
