如何设置ax.legend字体大小？

Question

这是我的代码

import os,sys
import Image
import matplotlib.pyplot as plt
from matplotlib.pyplot import *
from matplotlib.font_manager import FontProperties

jpgfile = Image.open("t002.jpg")

# Set up the figure and axes.
fig = plt.figure(figsize=(18,10))  # ...or whatever size you want.
ax = fig.add_subplot(111)
ax.legend(fontsize=18)
# Draw things.
plt.imshow(jpgfile)  # Unlike plot and scatter, not a method on ax.
ax.set_xlabel('normalized resistivities')
ax.set_ylabel('normalized velocities')
ax.set_xticks([]); ax.set_yticks([])

# Save and show.
plt.savefig("fig.jpg")
plt.show()

但是。

/usr/local/lib/python2.7/dist-packages/matplotlib/axes/_axes.py:519: UserWarning: No labelled objects found. Use label='...' kwarg on individual plots

我该如何设置标签？

- Richard Rublev

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在我看来，这不是一个重复的问题。 - tommy.carstensen

Answer 1

通过向'prop'关键字参数提供字体属性-值对的字典来自定义图例字体：

ax.legend(prop=dict(size=18))

- farenorth