在python中，默认情况下是无法显示中文的，如下代码：
import matplotlib.pyplot as plt# 定义文本框和箭头格式decisionNode = dict(boxstyle = "sawtooth", fc = "0.8")leafNode = dict(boxstyle = "round4", fc = "0.8")arrow_args = dict(arrowstyle = "<-")# 绘制带箭头的注解def plotNode(nodeTxt, centerPt, parentPt, nodeType) :createPlot.ax1.annotate(nodeTxt, xy = parentPt, xycoords = 'axes fraction', xytext = centerPt, textcoords = 'axes fraction', va = 'center', ha = 'center', bbox = nodeType, arrowprops = arrow_args)def createPlot() :fig = plt.figure(1, facecolor='white')fig.clf()createPlot.ax1 = plt.subplot(111, frameon = False)plotNode(U'决策节点', (0.5, 0.1), (0.1, 0.5), decisionNode)plotNode(U'叶节点', (0.8, 0.1), (0.3, 0.8), leafNode)plt.show()createPlot()
得到图像如下：
产生中文乱码的原因就是字体的默认设置中并没有中文字体，所以我们只要手动添加中文字体的名称就可以了
手动增加如下代码
from pylab import * mpl.rcParams['font.sans-serif'] = ['SimHei']
源代码修改如下：
import matplotlib.pyplot as pltfrom pylab import *mpl.rcParams['font.sans-serif'] = ['SimHei']# 定义文本框和箭头格式decisionNode = dict(boxstyle = "sawtooth", fc = "0.8")leafNode = dict(boxstyle = "round4", fc = "0.8")arrow_args = dict(arrowstyle = "<-")# 绘制带箭头的注解def plotNode(nodeTxt, centerPt, parentPt, nodeType) :createPlot.ax1.annotate(nodeTxt, xy = parentPt, xycoords = 'axes fraction', xytext = centerPt, textcoords = 'axes fraction', va = 'center', ha = 'center', bbox = nodeType, arrowprops = arrow_args)def createPlot() :fig = plt.figure(1, facecolor='white')fig.clf()createPlot.ax1 = plt.subplot(111, frameon = False)plotNode(U'决策节点', (0.5, 0.1), (0.1, 0.5), decisionNode)plotNode(U'叶节点', (0.8, 0.1), (0.3, 0.8), leafNode)plt.show()createPlot()
最终得到图像
成功！
