我刚接触python，我尝试用matplotlib创建一个图表，我可以创建第一行，没有问题，我定义了两个长度相同的x和y值列表，对于第二行，我尝试绘制一个图表，显示第一行中每个x的最大y值，我的问题是，我必须显式地写max吗（y1）x次，或者是否有方法自动化该过程？

x1 = [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]

y1 = [36.37, 36.18, 36.31, 36.24, 36.31, 36.37, 36.18, 36.43, 36.12, 36.24, 36.06, 36.31, 36.12, 36.49, 36.74, 36.74]

plt.plot(x1, y1, color='black', marker='o', markerfacecolor='black', markersize='10', label='line1')

# I could just write x1 but this was a little easier for me to structure my code
x2 = x1

# Do I have to write [max(y1), max(y1), max(y1) ..., max(y1)] here or can I make a list with fewer items to represent one line (in this case y=36.74)
y2 = [max(y1)]

plt.plot(x2, y2, color='#30C3BF', linestyle='dashed', label='line2')