python可视化---并列柱状图

import matplotlib.pyplot as plt
import matplotlib as mpl
import numpy as np

mpl.rcParams["font.sans-serif"] = ["SimHei"]
mpl.rcParams["axes.unicode_minus"] = False

x = np.arange(5)
y = [6, 10, 4, 5, 1]
y1 = [2, 6, 3, 8, 5]

bar_width = 0.35
tick_label = ["A", "B", "C", "D", "E"]

plt.bar(x, y, bar_width, align="center", color="c", label="班级A", alpha=0.5)
plt.bar(x+bar_width, y1, bar_width, color="b", align="center", label="班级", alpha=0.5)

plt.xlabel("测试难度")
plt.ylabel("试卷份数")

plt.xticks(x+bar_width/2, tick_label)

plt.legend()

plt.show()