【轉】 Python 中，matplotlib繪圖無法顯示中文的問題

在python中，默認情況下是無法顯示中文的，如下代碼：

import matplotlib.pyplot as plt

# 定義文本框和箭頭格式
decisionNode = dict(boxstyle = "sawtooth", fc = "0.8")
leafNode = dict(boxstyle = "round4", fc = "0.8")
arrow_args = dict(arrowstyle = "<-")

# 繪制帶箭頭的注解
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'決策節點', (0.5, 0.1), (0.1, 0.5), decisionNode)
    plotNode(U'葉節點', (0.8, 0.1), (0.3, 0.8), leafNode)
    plt.show()

createPlot()

 

得到圖像如下：

 

產生中文亂碼的原因就是字體的默認設置中並沒有中文字體，所以我們只要手動添加中文字體的名稱就可以了

手動增加如下代碼

 

from pylab import *
mpl.rcParams['font.sans-serif'] = ['SimHei']

源代碼修改如下：

 

 

import matplotlib.pyplot as plt

from pylab import *
mpl.rcParams['font.sans-serif'] = ['SimHei']

# 定義文本框和箭頭格式
decisionNode = dict(boxstyle = "sawtooth", fc = "0.8")
leafNode = dict(boxstyle = "round4", fc = "0.8")
arrow_args = dict(arrowstyle = "<-")

# 繪制帶箭頭的注解
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'決策節點', (0.5, 0.1), (0.1, 0.5), decisionNode)
    plotNode(U'葉節點', (0.8, 0.1), (0.3, 0.8), leafNode)
    plt.show()
createPlot()

最終得到圖像

 

 

成功！

原文鏈接：http://blog.csdn.net/u013038499/article/details/52449768