问显示-TypeError的代码有什么问题：需要类似字节的对象，而不是'str'

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from IPython.display import Image as IPythonImage
from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw

def display_cover(top,bottom ):
    import requests
    name='album_art_raw.png'
    album_art_raw = requests.get('https://picsum.photos/500/500/?random')
    with open(name,'wb') as album_art_raw_file:
       album_art_raw_file.write('album_art_raw.content')
    img = Image.open("album_art_raw.png")
    draw = ImageDraw.Draw(img)
    band_name_font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", 25) #25pt font
    album_name_font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", 20) # 20pt font
    band_x, band_y = 50, 50
    album_x, album_y = 50, 400
    outline_color ="black"

    draw.text((band_x-1, band_y-1), top, font=band_name_font, fill=outline_color)
    draw.text((band_x+1, band_y-1), top, font=band_name_font, fill=outline_color)
    draw.text((band_x-1, band_y+1), top, font=band_name_font, fill=outline_color)
    draw.text((band_x+1, band_y+1), top, font=band_name_font, fill=outline_color)

    draw.text((album_x-1, album_y-1), bottom , font=album_name_font, fill=outline_color)
    draw.text((album_x+1, album_y-1), bottom , font=album_name_font, fill=outline_color)
    draw.text((album_x-1, album_y+1), bottom , font=album_name_font, fill=outline_color)
    draw.text((album_x+1, album_y+1), bottom , font=album_name_font, fill=outline_color)

    draw.text((band_x,band_y),top,(255,255,255),font=band_name_font)
    draw.text((album_x, album_y),bottom,(255,255,255),font=album_name_font)

    return img
# calling function
img=display_cover(top='top',bottom='bottom')