用 matplotlib 使用条形图绘制至少三个班级的男女人数

以下是使用 matplotlib 绘制三个班级男女人数的代码示例：

import matplotlib.pyplot as plt

# 三个班级的男女人数
class1_males = 20
class1_females = 30

class2_males = 25
class2_females = 20

class3_males = 15
class3_females = 25

# 绘制条形图
classes = ['Class 1', 'Class 2', 'Class 3']
males = [class1_males, class2_males, class3_males]
females = [class1_females, class2_females, class3_females]

bar_width = 0.35
r1 = range(len(classes))
r2 = [x + bar_width for x in r1]

plt.bar(r1, males, color='blue', width=bar_width, edgecolor='white', label='Males')
plt.bar(r2, females, color='pink', width=bar_width, edgecolor='white', label='Females')

plt.xlabel('Classes')
plt.ylabel('Number of Students')
plt.title('Number of Male and Female Students in Three Classes')

plt.xticks([r + bar_width / 2 for r in range(len(classes))], classes)

plt.legend()
plt.show()

输出结果如下图所示：