Python3.x matplotlib.pyplot 多边形，具有相同的纵横比和紧凑的布局

我想在等宽的轴上绘制一组多边形，并在图形上应用紧密布局.

然而，当同时使用等宽和紧凑布局时，图形大小似乎没有得到正确调整.

try 1

等宽紧凑布局

import matplotlib.pyplot as plt
from matplotlib.patches import Polygon
import numpy as np

fig, ax = plt.subplots(1,1)
l = 5
h = 1
poly = Polygon(
    np.array([
        [0,0],
        [l,0],
        [l,h],
        [0,h]
    ]),
    edgecolor="black",
    facecolor="gray",
)
ax.add_patch(poly)
ax.set_aspect("equal")
ax.set_xlim(0,l)
ax.set_ylim(0,h)
ax.set_xlabel(r"$x$")
ax.set_ylabel(r"$y$", rotation=0, labelpad=5)
fig.tight_layout(pad=0.25)
plt.show()

输出:注意顶部和底部的额外空间.还要注意，y轴标签超出界限.

try 2

布局紧凑，无等宽

import matplotlib.pyplot as plt
from matplotlib.patches import Polygon
import numpy as np

fig, ax = plt.subplots(1,1)
l = 5
h = 1
poly = Polygon(
    np.array([
        [0,0],
        [l,0],
        [l,h],
        [0,h]
    ]),
    edgecolor="black",
    facecolor="gray",
)
ax.add_patch(poly)
# ax.set_aspect("equal")
ax.set_xlim(0,l)
ax.set_ylim(0,h)
ax.set_xlabel(r"$x$")
ax.set_ylabel(r"$y$", rotation=0, labelpad=5)
fig.tight_layout(pad=0.25)
plt.show()

输出:效果良好，但纵横比不相等

如何实现紧密布局and等纵横比？