使用matplotlib绘制热图(heatmap)全过程

import random
from matplotlib import pyplot as plt
from matplotlib import cm
from matplotlib import axes
from matplotlib.font_manager import FontProperties
font = FontProperties(fname='/Library/Fonts/Songti.ttc')
 
def draw():
    #定义热图的横纵坐标
    xLabel = ['A','B','C','D','E']
    yLabel = ['1','2','3','4','5']
 
    #准备数据阶段，利用random生成二维数据（5*5）
    data = []
    for i in range(5):
        temp = []
        for j in range(5):
            k = random.randint(0,100)
            temp.append(k)
        data.append(temp)
 
    #作图阶段
    fig = plt.figure()
    #定义画布为1*1个划分，并在第1个位置上进行作图
    ax = fig.add_subplot(111)
    #定义横纵坐标的刻度
    ax.set_yticks(range(len(yLabel)))
    ax.set_yticklabels(yLabel, fontproperties=font)
    ax.set_xticks(range(len(xLabel)))
    ax.set_xticklabels(xLabel)
    #作图并选择热图的颜色填充风格，这里选择hot
    im = ax.imshow(data, cmap=plt.cm.hot_r)
    #增加右侧的颜色刻度条
    plt.colorbar(im)
    #增加标题
    plt.title("This is a title", fontproperties=font)
    #show
    plt.show()
 
d = draw()

im = ax.imshow(data, cmap=plt.cm.hot_r)