基础条形图
运行图示：
代码如下：
# 条形图：.barh(y, width, height=0.8, left=None, *, align='center', **kwargs)
import matplotlib.pyplot as plt
import numpy as np
size = 5
x = np.arange(size)
a = np.random.random(size)
b = np.random.random(size)
c = np.random.random(size)
# ================条形图===============
plt.barh(x, a, height=0.4)
plt.show()
