Matplotlib库（2）基础绘图函数

核心：拿到数据后，如何选择合适的图形绘制方法来展示数据（经验）

一、概述

 二、饼图 （百分数类型的数据）plt.pie()

import matplotlib.pyplot as plt

labels = 'Frogs','Hogs','Dogs','Logs'
sizes = [15,30,45,10]
explode = (0,0.1,0,0)
plt.pie(sizes,explode=explode,labels=labels,autopct='%1.1f%%',
        shadow=False,startangle=90)
plt.show()

 三、直方图plt.hist()

 四、极坐标图

import matplotlib.pyplot as plt
import numpy as np

N = 20
theta = np.linspace(0.0,2*np.pi,N,endpoint=False)
radii = 10*np.random.rand(N)
width = np.pi/4*np.random.rand(N)

ax = plt.subplot(111,projection='polar')
bars = ax.bar(theta,radii,width = width, bottom = 0.0)

for r,bar in zip(radii,bars):
    bar.set_facecolor(plt.cm.viridis(r/10.))
    bar.set_alpha(0.5)

plt.show()

 五、散点图

import matplotlib.pyplot as plt
import numpy as np

fig,ax = plt.subplots()
ax.plot(10*np.random.randn(100),10*np.random.randn(100),'o')
ax.set_title('Simple Scatter')

plt.show()