import matplotlib.pyplot as plt

labels = ['G1', 'G2', 'G3', 'G4', 'G5']
first = [20, 34, 30, 35, 27]
second = [25, 32, 34, 20, 25]
third = [21, 31, 37, 21, 28]
fourth = [26, 31, 35, 27, 21]
data = [first, second, third, fourth]

x = range(len(labels))
width = 0.35

# 將bottom_y元素都初始化為0
bottom_y = [0] * len(labels)
# 計算每組柱子的總和，為計算百分比做準(zhǔn)備
sums = [sum(i) for i in zip(first, second, third, fourth)]
for i in data:
 # 計算每個柱子的高度，即百分比
 y = [a/b for a, b in zip(i, sums)]
 plt.bar(x, y, width, bottom=bottom_y)
 # 計算bottom參數(shù)的位置
 bottom_y = [(a+b) for a, b in zip(y, bottom_y)]

plt.xticks(x, labels)
plt.title('Percent stacked bar ')
plt.show()

import numpy as np
import matplotlib.pyplot as plt

labels = ['G1', 'G2', 'G3', 'G4', 'G5']
first = [20, 34, 30, 35, 27]
second = [25, 32, 34, 20, 25]
third = [21, 31, 37, 21, 28]
fourth = [26, 31, 35, 27, 21]
data = [first, second, third, fourth]

x = range(len(labels))
width = 0.35

# 將bottom_y元素都初始化為0
bottom_y = np.zeros(len(labels))
data = np.array(data)
# 按列計算計算每組柱子的總和，為計算百分比做準(zhǔn)備
sums = np.sum(data, axis=0)
for i in data:
 # 計算每個柱子的高度，即百分比
 y = i / sums
 plt.bar(x, y, width, bottom=bottom_y)
 # 計算bottom參數(shù)的位置
 bottom_y = y + bottom_y

plt.xticks(x, labels)
plt.title('Percent stacked bar ')
plt.show()