Matplotlib.axes.Axes.set_alpha() in Python

# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
 
# create test data
np.random.seed(10**7)
data = [sorted(np.random.normal(0, std, 100)) 
       for std in range(1, 5)]
 
fig, ax1 = plt.subplots()
val = ax1.violinplot(data)
ax1.set_ylabel('Result')
ax1.set_xlabel('Domain Name')
for i in val['bodies']:
    i.set_facecolor('green')
    i.set_alpha(0.9) 
 
fig.suptitle('matplotlib.axes.Axes.set_alpha() \
function Example\n\n', fontweight ="bold")

plt.show()

# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.patches import Ellipse
 
NUM = 200
 
ells = [Ellipse(xy = np.random.rand(2) * 10,
                width = np.random.rand(), 
                height = np.random.rand(),
                angle = np.random.rand() * 360)
        for i in range(NUM)]
 
fig, ax = plt.subplots(subplot_kw ={'aspect': 'equal'})

for e in ells:
    ax.add_artist(e)
    e.set_clip_box(ax.bbox)
    e.set_alpha(np.random.rand())
    e.set_facecolor(np.random.rand(4))
 
ax.set_xlim(3, 7)
ax.set_ylim(3, 7)
 
 
fig.suptitle('matplotlib.axes.Axes.set_alpha()\
 function Example\n\n', fontweight ="bold")

plt.show()