import matplotlib.pyplot as plt
import numpy as np
import pylab as pl
x1=[1,2,3,4,5]
y1=[1,4,9,16,25]
x2=[1,2,4,6,8]
y2=[2,4,8,12,16]
plot1=pl.plot(x1, y1, "r")
plot2=pl.plot(x2,y2,"go")
pl.title("Plot of y vs. x")
pl.xlabel("x axis")
pl.ylabel("y axis")
pl.xlim(0.0, 9.0)
pl.ylim(0.0, 30.0)
pl.legend([plot1, plot2], ("red line", "green circles"), "best", numpoints=1)
##pl.legend([plot1, plot2])
pl.show()
结果能显示，但是无法显示标签label。
figure_1.png
报错信息：
Warning (from warnings module):
File "C:\Python27\lib\site-packages\matplotlib\legend.py", line 613
(str(orig_handle),))
UserWarning: Legend does not support [<matplotlib.lines.Line2D object at 0x05B081F0>]
Use proxy artist instead.
http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist
Warning (from warnings module):
File "C:\Python27\lib\site-packages\matplotlib\legend.py", line 613
(str(orig_handle),))
UserWarning: Legend does not support [<matplotlib.lines.Line2D object at 0x05B083D0>]
Use proxy artist instead.
http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist
=======================================================
修正代码：
import matplotlib.pyplot as plt
import numpy as np
import pylab as pl
x1=[1,2,3,4,5]
y1=[1,4,9,16,25]
x2=[1,2,4,6,8]
y2=[2,4,8,12,16]
plot1, =pl.plot(x1, y1, "r") # 这个 ，一定要有，不然legend会报错
plot2, =pl.plot(x2,y2,"go")
pl.title("Plot of y vs. x")
pl.xlabel("x axis")
pl.ylabel("y axis")
pl.xlim(0.0, 9.0)
pl.ylim(0.0, 30.0)
pl.legend([plot1, plot2], ("red line", "green circles"), "best", numpoints=1)
##pl.legend([plot1, plot2])
pl.show()
图示：
![]()
figure_2.png
figure_2.png
终于解决了TnT
