我正在寻找一种方法来设置透明度的箱线图面色。现在它显示为“红色”，alpha=1。我如何改变它为'红色'与alpha为0.5，例如，同时保持框的边缘颜色不透明的'黑色'？我只需要面色的透明度，而不是边色的透明度。有什么想法吗？

验证码：

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.colors as cls
import matplotlib

matplotlib.interactive(True)

df = pd.DataFrame({"A": [18,28,29,32,35,36,37,37,39,40,42,42,46,48,54,56,57,61,61,62,63,65],
                   "B":  [9,13,17,15,23,21,24,28,26,30,29,30,38,42,40,48,40,51,54,50,51,57],
                   "C": [1,98,65,47,58,95,24,5,63,7,41,5,6,84,56,96,33,25,61,94,68,83]})

columns = ['A', 'B']
df_data = df.loc[:, columns]

def boxplot(y_lims, y_lime):
    plt.figure(figsize=((12.0 / 2.54), (7.42 / 2.54)), facecolor=None, edgecolor='black')  
    fig, ax = plt.subplots() 
    boxprops = dict(linestyle='-', linewidth=0.6)  
    bp = df_data.boxplot(ax=ax, grid=False, showfliers=False, boxprops=boxprops, showmeans=True, return_type='dict', patch_artist=True)
    [patch.set(facecolor='red', alpha=1.0) for patch in bp['boxes']]   #if alpha=0.5; both face and edge color are transparent, I only want the facecolor to be transparent 
    [patch.set_edgecolor('black') for patch in bp['boxes']]
    [item.set_color('black') for item in bp['whiskers']]
    [item.set_color('black') for item in bp['caps']]
    [item.set_marker('.') for item in bp['means']]
    [item.set_markerfacecolor('black') for item in bp['means']]
    [item.set_markeredgecolor('black') for item in bp['means']]
    [item.set_color('black') for item in bp['medians']]

    ax.set_ylim(y_lims, y_lime)    
    plt.show()

if __name__ == '__main__':

    Boxplot_a = boxplot(None, None)

注意：- rgba-colors并没有做到这一点，alpha由于某种原因无法识别