python 生成字符图片

from PIL import Imageimport argparse#can shu chu liparser = argparse.ArgumentParser()parser.add_argument('file')parser.add_argument('-o','--output')parser.add_argument('--width',type = int ,default = 72)parser.add_argument('--height',type = int, default = 40)args = parser.parse_args()IMG = args.fileWIDTH = args.widthHEIGHT = args.heightOUTPUT = args.outputascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!;:,\"^`'.")def get_char(r,b,g,alpha = 256):   if alpha == 0:      return ' '   length = len(ascii_char)   gray = int(0.2126*r+0.7152*g+0.0722*b)   unit = (256.0+1)/length   return ascii_char[int(gray/unit)]if __name__ == '__main__':   im = Image.open(IMG)   im = im.resize((WIDTH,HEIGHT),Image.NEAREST)   txt = ""   for i in range(HEIGHT):      for j in range(WIDTH):         txt += get_char(*im.getpixel((j,i)))      txt += '\n'   print(txt)   if OUTPUT:      with open(OUTPUT,'w') as f:         f.write(txt)   else:      with open("output.txt",'w') as f:         f.write(txt)