matplotlib绘制饼图的基本配置(万能模板案例)

# -*- coding: utf-8 -*-
import pymysql
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
plt.rcParams['font.sans-serif'] = ['SimHei']   #显示中文
plt.rcParams['axes.unicode_minus']=False       #正常显示负号
 
#连接Mysql数据库
db = pymysql.connect(host='localhost',  # 主机名
                    user='root',        # 用户名
                    password='root',    # 密码
                    database='mydb')  # 默认数据库
 
 
# 获取游标对象
cursor = db.cursor()
 
# 构造一个sql语句来查询统计数据
sql_str = "SELECT PROD_CATEGORY as 产品分类, ROUND(SUM(PRICE),2) as 总销售额, ROUND(SUM(PROFIT),2) as 总利润额  FROM orders WHERE FY=2019 GROUP BY PROD_CATEGORY"
 
# 执行sql语句
cursor.execute(sql_str)
 
# 获取查询结果
result = cursor.fetchall()
df = pd.DataFrame(result, columns=[cursor.description[i][0] for i in range(len(cursor.description)) ])
print(df)
df.set_index('产品分类').plot(kind='pie',y='总利润额',
                          #subplots=True, # 不使用y，画出所有列的饼图
                          figsize=(8,8),
                          
                         )

import matplotlib.pyplot as plt
 
sizes = df['总利润额']
labels = df['产品分类']
plt.figure(figsize=(5,5),dpi=120)
plt.pie(sizes,         # 每个扇区大小
        labels=labels, # 每个扇区标签
        autopct='%.2f%%', # 计算百分比格式 %格式%   %d%% 整数百分比  %.2f%% 小数点后保留2位的浮点数百分比
        
       )

# 扇区分离
explode = [0 for i in range(len(sizes))]
explode[1]=0.1
plt.pie(sizes,labels=labels,explode=explode )
 
plt.title("饼图示例1")
plt.show()

# 扇区颜色
colors=['r','g','b','#EEEEEE']
plt.pie(sizes,labels=labels,explode=explode,colors=colors )
 
plt.title("饼图示例2")
plt.show()

# 添加阴影
shadow = True
plt.pie(sizes,explode=explode,labels=labels,colors=colors,shadow=shadow)
plt.show()

# 显示百分比
autopct='%.0f%%'
pctdistance=1.25
plt.pie(sizes,explode=explode,labels=labels,colors=colors,shadow=shadow,autopct=autopct,pctdistance=pctdistance) 
plt.show()

# 起始角度
startangle=36 # (->0, <-180, 逆时针)
 
explode = [0 for i in range(len(sizes))]
explode[3]=0.1
shadow=False
plt.pie(sizes,explode=explode,labels=labels,colors=colors,shadow=shadow,autopct=autopct,startangle=startangle) 
plt.show()

import matplotlib.pyplot as plt
plt.rcParams['font.sans-serif']=['SimHei'] #用来正常显示中文标签
plt.rcParams['figure.dpi'] = 120
 
 
sizes = [10,10,10,70]
labels = ['A','B','C','D']
 
figure = plt.figure(figsize=(5,5),facecolor='#CCCCCC')
 
center=(5,4)  # 
 
plt.title("饼图详解示例")
pieces,labelses,pcts = plt.pie(sizes,labels=labels,center=center,frame=True,labeldistance=0.88,autopct='%.1f%%')
pieces[3].set(color='grey')
labelses[3].set(color='red')
pcts[3].set(color='green')

plt.rcParams['figure.dpi'] = 120
plt.figure(figsize=(8,4),facecolor='#EEEEEE')
 
center1=(1,0)
center2=(2.5,0)
 
plt.pie(sizes,explode=explode,labels=labels,colors=colors,shadow=False,autopct=autopct,radius=0.5,
        center=center1,frame=True,labeldistance=0.9,rotatelabels=True) 
plt.pie(sizes,explode=explode,labels=labels,colors=colors,shadow=shadow,autopct=autopct,radius=0.5,
        center=center2,frame=True,labeldistance=0.9,rotatelabels=False) 
plt.show()

import matplotlib.pyplot as plt
# 添加数据
sizes = [15, 30, 45, 10]
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
# 配置颜色
colors = ['yellowgreen', 'gold', 'lightskyblue', 'lightcoral']
# 配置
explode = (0, 0.1, 0, 0)
plt.pie(sizes, explode=explode, labels=labels, colors=colors,autopct='%1.1f%%', shadow=True, startangle=90)
plt.axis('equal')
# 设置全局中文字体
plt.rcParams['font.sans-serif'] = 'KaiTi' # 设置全局字体为中文 楷体
plt.rcParams['axes.unicode_minus'] = False # 不使用中文减号
# 设置图形上的各类主题值
# plt.suptitle('饼图',size=15,y=1.0)
plt.title("饼图", loc='center',size=15,y=1)
 
plt.title("王小王-123于2022年3月绘制", loc='right',size=10,y=1)
 
plt.show()