python画环形图的方法

本文实例为大家分享了python画环形图的具体代码，供大家参考，具体内容如下

import os

import pandas as pd
import matplotlib.pyplot as plt
import random
import numpy as np

# 获取渐变色的list
def gradual(number):
colors = []
h = 0.00001
gradual2 = random.uniform(0, 1)
r = gradual2
if gradual2 >= 0.5:
 g = h
 b = gradual2
else:
 g = gradual2
 b = h
colors.append((r, g, b, 1))
for i in range(number - 1):
 # 大于0.5 则为绿色渐变，小于则为蓝色渐变
 if gradual2 >= 0.5:
  g = 1 if ((1 - h) / number) > 1 else (g + (1 - h) / number)
 else:
  b = 1 if ((1 - h) / number) > 1 else (b + (1 - h) / number)
 colors.append((r, g, b, 1))
return colors

# 获取绿色的个数,standardRedIndex为要将那个颜色改为红色
def listGreen(number, standardRedIndex):
colors = []
for i in range(number):
 if i == standardRedIndex - 1:
  colors.append('r')
 else:
  colors.append('#6CAD4F')
return colors

# 画环形图
def circularGraph(outerData, innerData, labels, standardRedIndex):
data = pd.DataFrame([outerData, innerData], columns=labels)
# 设置字体这样才可以显示中文
plt.rcParams['font.sans-serif'] = 'Microsoft YaHei'
plt.rcParams['axes.unicode_minus'] = False
plt.figure(figsize=(8, 5))
colors = gradual(len(labels))
# 数据内环
plt.pie(data.iloc[1, :], radius=0.65, wedgeprops=dict(width=0.3, edgecolor='w'), colors=colors)
# 数据外环
plt.pie(data.iloc[0, :], radius=1, wedgeprops=dict(width=0.3, edgecolor='w'),
  colors=listGreen(len(labels), standardRedIndex))
# 获取ax label
ax = plt.subplot(1, 1, 1)
# loc是位置，bbox_to_anchor是位置坐标，borderaxespad将图例放外面 frameon=False去掉图例边框
# bbox_to_anchor 的y坐标
y = -1 / 40 * len(labels) + 0.5
ax.legend(labels, loc=4, bbox_to_anchor=(1.3, y), borderaxespad=0., frameon=False)
plt.show()

circularGraph([30, 30, 20, 40, 20, 20, 40, 20, 20, 40, 20], [30, 30, 20, 40, 20, 20, 40, 20, 20, 40, 20],
   ['甲硫杆菌', '霍尔德曼氏菌属', 'Faecali菌属', '瘤胃菌属', 'Faecali菌属', 'Faecali菌属', '瘤胃菌属', 'Faecali菌属', 'Faecali菌属', '瘤胃菌属', 'Faecali菌属'], 3)

更多精彩内容请点击专题： 《python图片处理操作》

来源：https://blog.csdn.net/Carlsummer/article/details/86588716