import matplotlib.pyplot as plt 
import numpy as np

labels = ['苹果','华为','小米','三星']
values = [10,30,45,15]
colors = ['red','yellowgreen','blue','lightskyblue']
plt.pie(values,labels=labels,colors=colors)
plt.show()

labels = ['苹果','华为','小米','三星']
values = [10,30,45,15]

'''在绘制饼图之前，指定图表的大小，令其长宽一致'''
plt.figure(figsize=(6,6))

colors = ['red','yellowgreen','blue','lightskyblue']
plt.pie(values,labels=labels,colors=colors)
plt.show()

labels = ['苹果','华为','小米','三星']
values = [10,30,45,15]
colors = ['red','yellowgreen','blue','lightskyblue']
plt.pie(values,labels=labels,colors=colors)

'''equal表示平等、平衡的意思，即将x/y轴宽度调整为一致，与上例道理上是一样的'''
plt.axis('equal')

plt.show()

labels = ['苹果','华为','小米','三星']
values = [10,30,45,15]
colors = ['red','yellowgreen','blue','lightskyblue']

explode = [0.3,0,0,0]
plt.pie(values,labels=labels,colors=colors,explode=explode)

plt.axis('equal')
plt.show()

labels = ['苹果','华为','小米','三星']
values = [10,30,45,15]
colors = ['red','yellowgreen','blue','lightskyblue']
explode = [0.3,0,0,0]

'''顺便加个标题'''
plt.title('饼状图')
plt.pie(values,labels=labels,colors=colors,explode=explode,startangle=180)

plt.axis('equal')
plt.show()

labels = ['苹果','华为','小米','三星']
values = [10,30,45,15]
colors = ['red','yellowgreen','blue','lightskyblue']
explode = [0.3,0,0,0]
plt.title('饼状图')

plt.pie(values,
        labels=labels,
        colors=colors,
        explode=explode,
        shadow=True,  # 阴影
        autopct='%1.1f%%',  # 添加百分比，浮点数，保留一位
        startangle=180)

plt.axis('equal')
plt.show()

import pandas as pd

data = {'one':[1,3,4,5,5],
        'two':[2,4,5,2,7],
        'three':[3,2,4,8,9]}
df = pd.DataFrame(data)
df['one'].plot(kind='pie',figsize=(6,6))  # 指定图表类型和大小
plt.show()