1 import numpy as np 2 import matplotlib.pyplot as plt 3 size = 5 4 a = np.random.random(size) 5 b = np.random.random(size) 6 c = np.random.random(size) 7 d = np.random.random(size) 8 x = np.arange(size) 9 10 total_width, n = 0.8, 3     # 有多少个类型，只需更改n即可11 width = total_width / n12 x = x - (total_width - width) / 213 14 plt.bar(x, a,  width=width, label='a')15 plt.bar(x + width, b, width=width, label='b')16 plt.bar(x + 2 * width, c, width=width, label='c')17 plt.legend()18 plt.show()