python绘图

1.用python第三方库绘制sinx函数图像

import matplotlib.pyplot as plt
plt.rcParams['font.sans-serif'] = ['SimHei']
plt.rcParams['axes.unicode_minus'] = False
#plt.plot(x,y,s)  
import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0,2*np.pi,50) 
y = np.sin(x)
plt.title('3101')
plt.plot(x,y,'r+')
plt.show()



2.绘制饼状图

import matplotlib.pyplot as plt
labels = ['数学','专业课','英语','政治']
sizes = [40,40,10,10]   #每一块的比例
colors =['yellowgreen','gold','lightskyblue','lightcoral']   #每一块的颜色
explode = (0.2,0.1,0,0)    #突出显示

plt.pie(sizes,explode=explode,labels=labels,colors=colors,autopct='%1.1f%%',shadow=True,startangle=90)
plt.axis('equal')      #显示为圆，避免压缩成椭圆
plt.title('3101')

3.绘制箱型图

x = np.random.randn(1000)
D= pd.DataFrame([x,x+1]).T     #构造两列的DataFrame
D.plot(kind='box')       #Series内置绘图方法，指定参数为box
plt.title('3101')
#用annotate添加注释
plt.show()