Generate images with transparent pixels instead of white in python

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I have a small piece of python code with arrays, which generates random 24x24 avatars. Images are saved as PNG's, the background of those images are white. I want the white backgrounds to be transparent, however when I entered the RGBA value for the background, the code is simply not working.

Here is a small piece of code so you have a better idea.

# background color
bg = (238, 238, 238)
# outline color
ol = (0, 0, 0)

basic_bird = [
    [bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, ol, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, bg, ol, ol, hd, hd, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, hd, hd, ol, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, hd, hd, ol, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, hd, hd, hd, ol, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, ew, ew, hd, ew, ew, ol, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, ey, ew, hd, ey, ew, ol, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, hd, hd, hd, ol, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, ol, ol, ol, ol, ol, ol, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, bk, bk, bk, bk, bk, bk, ol, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, bk, bk, bk, bk, bk, bk, ol, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, hd, bk, bk, bk, bk, bk, bk, ol, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, ol, hd, hd, hd, hd, th, ol, ol, ol, ol, ol, ol, ol, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, ol, hd, hd, th, th, th, th, th, ol, bg, bg, ol, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, ol, hd, th, th, th, th, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, ol, hd, th, th, th, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, ol, hd, th, th, th, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, ol, hd, th, th, th, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg],
    [bg, bg, bg, bg, bg, bg, bg, bg, ol, hd, th, th, th, ol, bg, bg, bg, bg, bg, bg, bg, bg, bg, bg]
]

Sorry if am unable to explain myself well, please ask me anything so I can provide more info.



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